Here we have a standard major key 12-bar blues progression known in the industry as a Grinder. It’s one of the more common rhythmic grooves that you will find in the blues. Lots of time on each chord and this groove is often played as it is here with 5th chords and embellished with 6th chords. This one has the slow change to IV chord.

Once you hear the common 12 bar progression and that very identifiable major key blues rhythm you know that the jam is wide open for soling opportunities. Which avenues you ultimately decide upon utilizing will depend on your playing style and what types of moods or sounds you want to create.

What Relates to all the chords:

Try E Minor Pentatonic & Blues over all the chords for that minor bluesy vibe. Minor Pentatonic is often the first choice amongst blues players over I-IV-V blues progressions.

E Minor Pentatonic = E, G, A, B, D

Try E Major Pentatonic over all the chords for that sweet major sound. Remember that for most major key jams you can use Major Pentatonic over all the chords This will give you that sweet major bluesy sound that is quite different than the minor sound. Keep resolving back to those E notes to slam-dunk that major tonality:

Major Pentatonic = 1, 2, 3, 5, 6

E Major Pentatonic = E, F#, G#, B, C#

E Major Pentatonic is the same as C# Minor Pentatonic. E Major and C# Minor are relative major and minor. If you think more in terms of Minor Pentatonic or just know those shapes then play all your C# Minor Pentatonic scales, but start on and emphasize the E notes and it will be sweet sounding E Major Pentatonic.

E Major Pentatonic = E, F#, G#, B, C#

C# Minor Pentatonic = C#, E, F#, G#, B

(Same notes – just emphasize the root of the mode, E.)

Try E Dorian over all the chords. Because we know that both Major Pentatonic & Minor Pentatonic will work, we then know that the Dorian mode will also work. Dorian is considered more of a minor mode, but works great over major key I-IV-V blues, swings, and shuffle progressions.

Dorian has the minor elements in it (b3, b7) but also has some major elements, (2nd, 6th). So in these blues progressions the Dorian mode will give you that hybrid kind of minor/major sounds as it combines the elements of both minor and major.

Dorian Mode = 1, 2, b3, 4, 5, 6, b7

Dorian is the 2nd mode in any major key. To determine E Dorian ask what major scales’ 2nd note is an E note. The answer is D. So E Dorian is the same as D major:

E Dorian = E, F#, G, A, B, C#, D

D major = D, E, F#, G, A, B, C#

(Same notes – just emphasize the root of the mode, E.)

To play in E Dorian just play all your D major scales but start on and emphasize the E notes. Try resolving your licks focusing on those E notes to bring out that minor Dorian tonality.

Try mixing E Minor Pentatonic & Blues, E Major Pentatonic, and E Dorian over all the chords. Notice how going back and forth from the five-note pentatonics to the seven-note diatonic scales can be quite refreshing to the ear. Experiment and get creative!

Treat each chord like a separate event:

• Be sure to time your changes over each chord and listen closely to the rhythm to ensure you don’t get caught playing the wrong scale over a given chord.
• Try moving Minor Pentatonic & Blues over each chord. Play E Minor Pentatonic & Blues over the E chord.
• Play A Minor Pentatonic & Blues over the A chord. Play B Minor Pentatonic & Blues over the B chord.
• Try moving Major Pentatonic over each chord. Play E Major Pentatonic over the E chord. Play A Major Pentatonic over the A chord. Play B Major Pentatonic over the B chord.
• Try moving the Dorian mode over each chord. Play E Dorian, (=D major), over the E chord. Play A Dorian, (=G major), over the A chord. Play B Dorian, (=A major), over the B chord.

This track is what is called in the industry a “Train Beat”. It is in the key of G and it’s a 12-Bar blues I-IV-V slow change progression utilizing 7th chords. The chords are rolling by pretty fast, as it is an up-tempo groove. But you still have a little time on each chord to solo over them independently if you choose.

What Relates to all the chords:

Try G Minor Pentatonic & Blues over all the chords for that minor bluesy vibe. Minor Pentatonic is often the first choice amongst blues players over I-IV-V blues progressions.

G Minor Pentatonic & Blues = G, Bb, C, Db, D, F

Try G Major Pentatonic over all the chords for that sweet major sound. G Major Pentatonic is the same as E Minor Pentatonic. G Major and E Minor are relative major and minor. Play all your E Minor Pentatonic scales all over the neck, but start on and emphasize the G notes and it will be sweet sounding G Major Pentatonic. Keep going back and resolving to the G notes to bring out that major tonality.

G Major Pentatonic = G, A, B, D, E

E Minor Pentatonic = E, G, A, B, D

(Same notes – just emphasize the root of the mode, G.

Also try G Dorian over all the chords. Dorian works great over major key I-IV-V blues, swing, and shuffle progressions. In these blues progressions the Dorian mode will give you that hybrid kind of minor/major sounds as it combines the elements of both major and minor.

Dorian is the 2nd mode of the major scale so ask what major scales’ 2nd note is a G note. The answer is F. An F majors scales 2^nd note is a G note. So G Dorian is the same as F major, (G Dorian=F major). So play all your F major scales but start on and emphasize the G notes and you have G Dorian.

G Dorian = G, A, Bb, C, D, E, F

F Major = F, G, A, Bb, C, D, E,

(Same notes – just emphasize the root of the mode, G.)

Try mixing G Minor Pentatonic, G Major Pentatonic, and G Dorian over all the chords. See what sounds you like best and experiment. We can also explore the Mixolydian Mode, as you will want to throw that into the soup also, see below.

Treat each chord like a separate event:

Switch Pentatonics over each chord. Over the G7 chord try G Minor Pentatonic & Blues or G Major Pentatonic. Over the C7 chord try C Minor Pentatonic & Blues or C Major Pentatonic. Over the D7 chord try D Minor Pentatonic & Blues or D Major Pentatonic.

Try Mixolydian mode over each chord: Mixolydian mode works great over 7th chords as there is the b7 in 7th chords, (1,3,5,b7), as well as in the Mixolydian mode (1,2,3,4,5,6,b7). Mixolydian would be the mode of choice over each of the chords. Mixolydian mode sounds great over dominant chords like 7ths and 9ths. This is an incredibly useful mode, especially for blues and jazz playing.

The Mixolydian Mode is a seven-note scale often used in blues and rock. Mixolydian is considered a major mode and is always the 5th mode in any major key. Often it’s the mode of choice played over dominant chords, like dominant 7ths and 9ths. Mixolydian is basically a major scale, (Ionian Mode), but with a b7th interval instead of a natural 7^th:

Mixolydian Mode = 1, 2, 3, 4, 5, 6, b7

Major Scale (Ionian Mode) = 1, 2, 3, 4, 5, 6, 7

Over the G7 chord try G Mixolydian (=C Major). Over the C7 chord try C Mixolydian (=F Major). Over the D7 chord try D Mixolydian (=G Major).

Here we have a Mambo groove in the key of A starting off with a cool A6th chord slide. Again it’s a 12-bar I-IV-V with a slow change to the IV chord. So it’s pretty wide open for soloing opportunities.

What Relates to all the chords:

Remember that with major key I-IV-V blues, swings, and shuffles you can usually use Minor Pentatonic, Major Pentatonic, and The Dorian Mode over all the chords. These types of blues jam are wide open for many possible soloing opportunities.

Try A Minor Pentatonic & Blues for that minor, bluesy vibe.

A Minor Pentatonic & Blues – A, C, D, Eb, E, G

Try A Major Pentatonic over all the chords for that sweet major sound. Remember that for most major key jams you can use Major Pentatonic over all the chords. This will give you that sweet major bluesy sound that is quite different than the minor sound:

Major Pentatonic = 1, 2, 3, 5, 6

A Major Pentatonic = A, B, C#, E, F#

A Major Pentatonic is the same as F# Minor Pentatonic. A Major and F# minor are relative major and minor. Play all you’re F# Minor Pentatonic scales, but start on and emphasize the A notes and it will be A Major Pentatonic and have that sweet major sound.

A Major Pentatonic – A, B, C#, E, F#

F# Minor Pentatonic – F#, A, B, C#, E

(Same notes – just emphasize the root of the mode, A.)

Try A Dorian over all the chords. Dorian is considered more of a minor mode but works great over major key I-IV-V blues, swings, and shuffles. A Dorian is the same as G major, (A Dorian=G major).

A Dorian = A, B, C, D, E, F#, G

G Major = G, A, B, C, D, E, F#

(Same notes – just emphasize the root of the mode, A.)

So play all your G major scales but emphasize and start on the A notes and you have the cool minor sounds of A Dorian. Remember to keep going to back those A notes and make that the tonal center.

Try mixing A Minor Pentatonic, A Major Pentatonic, and A Dorian over all the chords. Explore and see which sound best to your ears.

Treat each chord like a separate event:

• Be sure to time your changes over each chord and really listen to the rhythm to ensure you don’t get caught playing the wrong scale over a given chord.
• Try moving Minor Pentatonic & Blues over each chord. Play A Minor Pentatonic & Blues over the A chord. Play D Minor Pentatonic & Blues over the D chord. Play E Minor Pentatonic & Blues over the E chord.
• Try moving Major Pentatonic over each chord. Play A Major Pentatonic over the A chord. Play D Major Pentatonic over the D chord. Play E Major Pentatonic over the E chord.
• Try Mixolydian mode over the D7 and E9 chords. Mixolydian works great over 7th and 9th chords. You don’t have much time on each chord as they are moving by pretty fast, but you can sneak a cool lick in there quickly. Mixolydian works great over dominant chords like 7th and 9^th chords as they contain a b7th interval. That b7th interval is also a keynote in the Mixolydian mode:

7^th chord = 1, 3, 5, b7

9^th chord = 1, 3, 5, b7, 9

Mixolydian Mode = 1, 2, 3, 4, 5, 6, b7

Mixolydian is an incredibly useful mode, especially for blues and jazz playing. The Mixolydian Mode is a seven-note scale often used in blues and rock. Mixolydian is considered a major mode and is always the 5th mode in any major key. Mixolydian is basically a major scale, (Ionian Mode), but with a b7th interval instead of a natural 7^th:

Mixolydian Mode = 1, 2, 3, 4, 5, 6, b7

Major Scale (Ionian Mode) = 1, 2, 3, 4, 5, 6,

Over the D7 chord try D Mixolydian (=G Major). Over the E9 chord try E Mixolydian (=A Major).

Here we have a standard major key 12-bar blues progression known in the industry as a Grinder. It’s one of the more common rhythmic grooves that you will find in the blues. Lots of time on each chord and this groove is often played as it is here with 5th chords and embellished with 6th chords.

What Relates to all the chords:

Try D Minor Pentatonic & Blues over all the chords for that minor bluesy vibe. Minor Pentatonic & Blues exudes that killer bluesy sound and is often the first choice for soloing over all the chords in a major key blues jam.

D Minor Pentatonic & Blues = D, F, G, Ab, A, C

Try D Major Pentatonic over all the chords. Remember that for most major key jams you can use Major Pentatonic over all the chords. This will give you that sweet major bluesy sound that is quite different than the minor sound. Major Pentatonic takes its five notes from the Major Scale, just leaves out the 4^th and 7^th intervals:

Major Pentatonic = 1, 2, 3, 5, 6

Major Scale – 1, 2, 3, 4, 5, 6, 7

D Major Pentatonic = D, E, F#, A, B

D Major Pentatonic is the same as B Minor Pentatonic. D Major and B Minor are relative major and minor. Play all your B Minor Pentatonic scales, but start on and emphasize the D notes and it will be D Major Pentatonic and have that sweet major sound.

D Major Pentatonic = D, E, F#, A, B

B Minor Pentatonic = B, D, E, F#, A

(Same notes – just emphasize the root of the mode, D.).

Try D Dorian over all the chords. Dorian is considered more of a minor mode but works great over major key I-IV-V blues, swing, and shuffle progressions. The Dorian Mode is a seven-note scale often used in blues, rock, and many other musical genres.

Dorian is considered a minor mode and is always the 2nd mode in any major key. Dorian produces a mystical, minor sound that is a bit sweeter than Aeolian. There is only one note difference between Dorian and Aeolian – the 6^th interval:

Dorian Mode = 1, 2, b3, 4, 5, 6, b7

Aeolian Mode = 1, 2, b3, 4, 5, b6, b7

Remember that Dorian is the second mode in any major key. So to play D Dorian, ask what major scales 2^nd note is a D note. The answer is C. C major has the same notes as D Dorian. So play C major scales but start on and emphasize the D notes and you have D Dorian. If you want to learn more about modal playing and Dorian please see the written lessons in this series.

D Dorian = D, E, F, G, A, B, C

C Major = C, D, E, F, G, A, B

(Same notes – just emphasize the root of the mode, D.)

Try mixing D Minor Pentatonic & Blues, D Major Pentatonic, as well as D Dorian over all the chords for some cool tones. Killer sounds can be created by switching back and forth from the pentatonic scales to Dorian scales. Fun stuff, give it a try and keep on rocking!

Treat each chord like a separate event:

• Be sure to time your changes over each chord and listen closely to the rhythm to ensure you don’t get caught playing the wrong scale over a given chord.
• Try moving Minor Pentatonic & Blues over each chord. Play D Minor Pentatonic & Blues over the D chord. Play G Minor Pentatonic & Blues over the G chord. Play A Minor Pentatonic & Blues over the A chord.
• Try moving Major Pentatonic over each chord. Play D Major Pentatonic over the D chord. Play G Major Pentatonic over the G chord. Play A Major Pentatonic over the A chord.
• Try moving the Dorian mode over each chord. Because the rhythm of this jam is embellished with 6th chords, Dorian is a great choice as that is a key interval in the Dorian mode (1,2,b3,4,5,6,b7)
• Play D Dorian, (=C major), over the D chord. Play G Dorian, (=F major), over the G chord. Play A Dorian, (=G major), over the A chord.

Here we have a slow blues jam in the key of E. This progression is a I-IV-V 12-Bar progression with a slow change to the IV chord. This is a slow tempo track so you have lots of time on each chord. This is perfect tempo wise if you to choose to solo by treating each chord as a separate event.

Since this is a major key I-IV-V blues jam its wide open and there are many options to consider. Much depends on what type of sounds you prefer or what emotions and moods you want to create. Are you feeling the sweet major sounds, or the minor bluesy sounds, or a combination of both?

Remember that with major key I-IV-V blues, swings, and shuffles you can usually use Minor Pentatonic, Major Pentatonic, and The Dorian Mode over all the chords. These types of blues jam are wide open for many possible soloing opportunities. As soon as you hear these very identifiable blues progressions you know that they are wide open and you can go hog wild if you wish.

What Relates to all the chords:

For that minor bluesy sound try E Minor Pentatonic & Blues over all the chords:

E Minor Pentatonic & Blues = E, G, A, Bb, B, D

For that sweet major sound try E Major Pentatonic over all the chords:

E Major Pentatonic = E, F#, G#, B, C#

Here is a little trick to make it easier to get to Major Pentatonic if you are not familiar. E Major Pentatonic is the same as C# Minor Pentatonic. E Major and C# Minor are relative major and minor so both are constructed from exactly the same notes:

E Major Pentatonic = E, F#, G#, B, C#

C# Minor Pentatonic = C#, E, F#, G#, B

(Same notes – just emphasize the root of the mode, E.)

If you think more in terms of Minor Pentatonic or just know those shapes then play all your C# Minor Pentatonic scales, but start on and emphasize the E notes and it will be E Major Pentatonic. By focusing on those E notes it will exude those sweet, happy, major sounds.

Try E Dorian over all the chords. Dorian is the 2nd mode in any major key. To determine E Dorian ask what major scales 2nd note is an E note. The answer is D. So E Dorian is the same as D major:

E Dorian = E, F#, G, A, B, C#, D

D major = D, E, F#, G, A, B, C#

(Same notes – just emphasize the root of the mode, E.)

Try playing D major scales but start on and emphasize the E notes. Resolve to and focus on those E notes and you are playing in E Dorian.

Try mixing E Minor Pentatonic, E Major Pentatonic, and E Dorian over all the chords for some killer sounds. Experiment, explore, and keep trying new and interesting things on the instrument.

Treat each chord like a separate event:

In this jam the chords are moving pretty slow so you have a lot of time on each chord. This is perfect for treating each chord as a separate event. Remember to listen to the rhythm and time your changes so you change your scale or landing notes as the chords change. Here are a few avenues to try:

• Try moving Minor Pentatonic & Blues scales over each chord. Play E Minor Pentatonic & Blues over the E chord and then play A Minor Pentatonic & Blues over the A chord and then B Minor Pentatonic & Blues over the B7 chord. Listen to how each pentatonic scale sounds as it outlines it’s corresponding chord.
• Try moving Major Pentatonic scales over each chord. Play E Major Pentatonic over the E chord,, and then play A Major Pentatonic over the A chord and then B Major Pentatonic over the B7 chord. Again, listen to the sounds of each scale and how they sound over each corresponding chord. It’s all about the sounds that you can create.
• Try mixing Minor Pentatonic and Major Pentatonic over each chord. For example try E Major Pentatonic over the E chord and then switch to E Minor Pentatonic & Blues over the A chord. Then try E Major Pentatonic over the B7 chord . Listen to how well this technique outlines and implies the chord changes.
• Try B Mixolydian over the B7 chord. Remember that Mixolydian is one of the modes of choice when soloing over 7th and 9th chords. Mixolydian is the 5th mode in any major scale. So to find the corresponding parent major scale for B Mixolydian ask what major scales 5th note is a B note. The answer is E, so B Mixolydian = E major:

B Mixolydian = B, C#, D#, E, F#, G#, A

E Major = E, F#, G#, A, B, C#, D#

(Same notes – just emphasize the root of the mode, B.)

Play E major scales and licks but start on and emphasize the B notes and you are now playing in B Mixolydian. Keep coming back to and resolving to those B notes while playing E major scales and you get the mood of B Mixolydian.

This track is what is known in the industry as a “box groove”. It’s a major key I-IV-V 12-bar blues with a slow change to the IV chord. You should hear that very identifiable major key 12-bar I-IV-V rhythm pattern. That pattern should alert you immediately that this track is wide-open for many soloing avenues.

What relates to all:

Since this is a major key I-IV-V blues jam its wide open and there are many options to consider. Much depends on what type of sounds you prefer or what emotions and moods you want to create. Are you feeling the sweet major sounds, or the minor bluesy sounds, or a combination of both?

Remember that with major key I-IV-V blues, swings, and shuffles you can usually use Minor Pentatonic, Major Pentatonic, and The Dorian Mode over all the chords. These types of blues jam are wide open for many possible soloing opportunities.

Try A Minor Pentatonic & Blues over all the chords for that minor, bluesy vibe.

A Minor Pentatonic & Blues – A, C, D, Eb, E, G

Try A Major Pentatonic over all the chords for that sweet major sound. A Major Pentatonic is the same as F# Minor Pentatonic, major and relative minor:

A Major Pentatonic – A, B, C#, E, F#

F# Minor Pentatonic – F#, A, B, C#, E

(Same notes – just emphasize the root of the mode, A.)

Play all your F# Minor Pentatonic scales, but start on and emphasize the A notes and it will be A Major Pentatonic and will exude that sweet major sound.

Try A Dorian over all the chords. Dorian works great over major key I-IV-V blues, swings, and shuffles. A Dorian is the same as G major, (A Dorian=G major).

A Dorian = A, B, C, D, E, F#, G

G Major = G, A, B, C, D, E, F#

(Same notes – just emphasize the root of the mode, A.)

So play all your G major scales but emphasize and start on the A notes and you have the cool minor sounds of A Dorian. Remember to keep going to back those A notes and make that the tonal center.

Try mixing A Minor Pentatonic, A Major Pentatonic, and A Dorian over all the chords. Explore and see which sound best to your ears.

Treat each chord as a separate event:

Try switching pentatonics over each chord. Over just the A chord try A Minor Pentatonic & Blues and A major pentatonic. Over just the D chord try D Minor Pentatonic & Blues or D Major Pentatonic. Over the E chord try E Minor Pentatonic & Blues or E Major Pentatonic.

Because the chords in this jam are dominant chords you can try the Mixolydian mode over each chord. Mixolydian mode sounds great over dominant chords like 7ths and 9ths. This is an incredibly useful mode, especially for blues and jazz playing.

The Mixolydian Mode is a seven-note scale often used in blues and rock. Mixolydian is considered a major mode and is always the 5th mode in any major key. Often it’s the mode of choice played over dominant chords, like dominant 7ths and 9ths. Mixolydian is basically a major scale, (Ionian Mode), but with a b7th interval instead of a natural 7^th:

Mixolydian Mode = 1, 2, 3, 4, 5, 6, b7

Major Scale (Ionian Mode) = 1, 2, 3, 4, 5, 6, 7

Try this mode over dominant chords like 7th and 9th chords when treating each chord as a separate event. Mixolydian is the 5th mode in any major key. Remember, the key is to shift the tonal center to the root of the mode.

So to play A Mixolydian over the A9 chord ask what major scale’s fifth note is an A note. The answer is D. The fifth note of a D major scale is an A note. So play D Major scales over the A9 chord but emphasize the A notes for A Mixolydian. D Major and A Mixolydian consist of the same notes:

A Mixolydian Mode -A, B, C#, D, E, F#, G

D Major scale – D, E, F#, G, A, B, C#

Remember, it’s all about MOOD and EMPHASIS when playing in the modes. Which note you start on and emphasize produces the different moods and sound textures of each mode. So be sure to switch to the root of the mode.

Over the A9 chord try A Mixolydian, (same as D Major). Over the D9 chord try D Mixolydian, (same as G Major). Over the E9 chord try E Mixolydian, (same as A Major).

Try mixing Minor Pentatonic and Major Pentatonic over each chord. For example play A Major Pentatonic over the A9 chord, then switch to A Minor Pentatonic & Blues over the D9 chord. Then try A Major Pentatonic again when you get to the E9 chord. Listen to how well this technique outlines and implies the chord changes. Mix this up a bit, maybe the next time around the progression try A Minor Pentatonic & Blues over the E9 chord instead of the major, or maybe Dorian – get creative and have fun!

This jam track is in the key of G and it’s a 12-Bar blues I-IV-V slow change progression utilizing 7th chords. Two things should scream when you hear this jam. The first is that it is a major key I-IV-V blues jam and therefore wide open to all kinds of soloing opportunities. The other is that the chords are dominant 7^th chords so Mixolydian and Major pentatonic should be on your list of potential soloing devices.

What Relates to all the chords:

There are many soloing options in this jam as it’s a major key I-IV-V 12-bar blues. Which avenues you choose will depend on your playing style and what type of mood or sounds you want to create.

Try G Minor Pentatonic & Blues over all the chords for that minor bluesy vibe. Minor Pentatonic is often the first choice amongst blues players over I-IV-V blues progressions.

G Minor Pentatonic & Blues = G, Bb, C, Db, D, F

Try G Major Pentatonic over all the chords for that sweet major sound. G Major Pentatonic is the same as E Minor Pentatonic. G Major and E Minor are relative major and minor. Play all your E Minor Pentatonic scales all over the neck, but start on and emphasize the G notes and it will be sweet sounding G Major Pentatonic. Keep resolving back to those G notes to hammer home the major tonality.

G Major Pentatonic = G, A, B, D, E

E Minor Pentatonic = E, G, A, B, D

(Same notes – just emphasize the root of the mode, G.

Also try G Dorian over all the chords. Dorian works great over major key I-IV-V blues, swing, and shuffle progressions. In these blues progressions the Dorian mode will give you that hybrid kind of minor/major sounds as it combines the elements of both major and minor.

Dorian is the 2nd mode of the major scale so ask what major scales’ 2nd note is a G note. The answer is F. An F majors scales 2^nd note is a G note. So G Dorian is the same as F major, (G Dorian=F major). So play all your F major scales but start on and emphasize the G notes and you have G Dorian.

G Dorian = G, A, Bb, C, D, E, F

F Major = F, G, A, Bb, C, D, E,

(Same notes – just emphasize the root of the mode, G.)

Try mixing G Minor Pentatonic, G Major Pentatonic, and G Dorian over all the chords. See what sounds you like best and experiment with all the above techniques and devices as well as come up with your own avenues.

Treat each chord like a separate event:

• Switch Pentatonics over each chord. Over the G7 chord try G Minor Pentatonic & Blues or G Major Pentatonic. Over the C7 chord try C Minor Pentatonic & Blues or C Major Pentatonic. Over the D7 chord try D Minor Pentatonic & Blues or D Major Pentatonic.
• Try Mixolydian mode over each chord. The Mixolydian mode works great over 7th chords as there is a b7th interval, (1,3,5,b7). There is also a b7th interval in the Mixolydian mode (1,2,3,4,5,6,b7). Mixolydian would be the mode of choice over the chords.
• Mixolydian mode sounds great over dominant chords like 7ths and 9ths. This is an incredibly useful mode, especially for blues and jazz playing.
• The Mixolydian Mode is a seven-note scale often used in blues and rock. Mixolydian is considered a major mode and is always the 5th mode in any major key. Often it’s the mode of choice played over dominant chords, like dominant 7ths and 9ths. Mixolydian is basically a major scale, (Ionian Mode), but with a b7th interval instead of a natural 7^th:

Mixolydian Mode = 1, 2, 3, 4, 5, 6, b7

Major Scale (Ionian Mode) = 1, 2, 3, 4, 5, 6, 7

Over the G7 chord try G Mixolydian (=C Major). Over the C7 chord try C Mixolydian (=F Major). Over the D7 chord try D Mixolydian (=G Major)