Know thy fretboard!Comparison of the distribution of chord tones in a 2-5-1 progression. All of the chords tones, and all of the extension tones of the chords fits nicely into one and the same scale - the Ab Major Scale. Notice the relation between arpeggios and intervals of the chords, the shared notes, and the tone that sets a chords apart. Altered dominant: Where you can superimpose pentatonic shapes over these changes? For instance, you can use F minor pentatonic over Bbm7, F# minor pentatonic over Eb7, and G minor pentatonic over Abmaj7. Then you're playing the 5, b7, 1, 9 and 11 of Bbm7; the #9, b5, #5, b7, and the b9 of Eb7; and the 7, 9, 3, #4 (the lydian sound), and the 6th over the Abmaj7.