Cm7, E7, Gbmaj7, C7, Dmaj7, Ab7, Bbmaj7 in Bb

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 Bb major

Each chord's roman numeral and role in Bb major
Chord	Numeral	Role
Cm7	ii7	Subdominant
E7	V7/vii	Secondary dominant, unresolved
G♭maj7	♭VImaj7	Borrowed from Bb minor
C7	V7/V	Secondary dominant, unresolved
Dmaj7	?	Outside the key (IIImaj7)
A♭7	♭VII7	Borrowed from Bb minor
B♭maj7	Imaj7	Tonic