Am7, D7, Bbm7, Eb7 in Ab

Tempo 120 BPM

Rootless Shells Guide tones Rooted shells Rooted Drop 2

Four-note rootless voicings in their two forms, with the 3rd or the 7th on the bottom, played over the root.

Customize each chord

Analysis

Heard in Ab major

Each chord's roman numeral and role in Ab major
Chord	Numeral	Role
Am7	♭ii7	ii of the ii-V to D7
D7	V7/vii	Secondary dominant, unresolved
B♭m7	ii7	Subdominant
E♭7	V7	Dominant