Watch the Mixolydian online guitar lesson by Robert Renman from Blues Booster
So compared to the Major scale, the Mixolydian is very different in sound and color, even though there's just one note that's different. It's an important note however! By lowering that major 7th note a half-step to a minor 7th, we get the Mixolydian mode. This scale works over Dominant 7 chords. Sometimes it's referred to as the Dominant Scale. We can use the Mixolydian mode for each of the chords in a blues, in this case the chords A7, D7 and E7. Let's do just that over a rhumba blues in the key of A. As you are studying the neck diagrams, you will see that these 3 modes/scales have many notes in common. It's the notes that are different that you want to pay the most attention to.