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Learn how to play the dorian mode oder a II V i progression in a jazzy contex.
Use the Gmaj Scale wich equals the A Dorian Mode to improvise oder the
pregression. The D9 Chord can be altered. You will hear the Dorian Sound over
the Am7 Chord if you emphasis the F# (Note) over Am7.
The rest of the vamp will be straight Gmaj if you use the Gmaj scale.