Amaj7, Bbdim7, Bm7, Bb7 in A

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 A major

Each chord's roman numeral and role in A major
Chord	Numeral	Role
Amaj7	Imaj7	Tonic
B♭dim7	♭ii°7	Passing diminished, rising to ii
Bm7	ii7	Subdominant
B♭7	subV7	Tritone substitute for V7