Here are the chord substitutions that I use to play the 1929 Fats Waller (pictured above) standard Ain't Misbehavin'. The verse is a great study in standard (I-vi-ii-V) chord progression substitution. In my arrangement, the opening progression has a great ascending chromatic bass line. Each box below represents one bar. The chord fingerings I use (in a Standard tuning) are as follows: Emaj7 = 022444; Fo7 = 1x010x; F#m7 = 2x2222; Go7 = 3x232x; E/G# = 4x245x; G#7#5 = 4x455x; A6 = 5x465x; Am6 = 5x4555; G7 = 3x34xx; B7b5/F = 1x120x; G#7 = 464544; C#7 = x4342x; F#7 = 242322; B7 = x2120x; C#m = x46654; A9 = 5x5600; B = x2444x; Co7 = x3x242; C#m7 = x46454. For variation, try substituting the "C#7" chord for the "G7" chord in the fifth bar of the A section. Also, try substituting the "Emaj7/G#-Go7-F#m7-Fo7" or "Emaj-C#7-F#m9-B13" progressions for the seventh and eighth bars of the A Section.