Take the shells (3rd + 7th) and add the 5th and 9th.
The root drops out — the bass player has it — and the left hand
becomes a four-note chord that defines the harmony all by itself.
These are the voicings most often associated with Bill Evans.
The voice leading is the magic: between any two chords, exactly
two voices hold and two move down a step. At each
change, the 3rd and 5th hold (becoming the next chord's 7th and
9th) while the 7th and 9th step down (becoming the next chord's
3rd and 5th). Track the held voices — that's why
these voicings feel inevitable.
A-form
3rd on bottom (3-5-7-9).
B-form
7th on bottom (7-9-3-5).
01
C major
02
F major
03
B♭ major
04
E♭ major
05
A♭ major
06
D♭ major
07
G♭ major
08
B major
09
E major
10
A major
11
D major
12
G major
Two voices hold, two voices move. Every Bill Evans voicing you've ever heard is a variation on this lesson.