12 bar blues rhythm study piece
This will work as a performance piece that you can use to accompany a soloist, record with a loop pedal to accompany yourself, or in a band if you leave out the bass notes (to be covered by the bass player). The Leslie speaker sound is very effective but will work nicely on acoustic or electric without a Leslie sound. The piece is played fingerstyle with the thumb playing the bass and the fingers
D9 playing the chords. From a theory point of view, any chord can be preceded by another chord a semitone away. This approach is used throughout the piece. Any dominant 7th chord can be substituted for another a semitone away (tritone substitution). For instance, in bar 12 the E7 is substituted for Bb7 which leads into the A7. The diminished 7ths in bar 16 lead nicely back to the A7.