Jazz Piano Chords: The Shell Voicing Exercise for Every 7th Chord and Its Tritone Sub

A shell voicing puts only the 3rd and 7th of a 7th chord in the right hand while the left hand plays the root and 5th, and running these shells through a long 2-5-1 loop in G major (Am7, D7, Gmaj7, Cmaj7, F#m7b5, B7, Em7, E7) teaches both shapes of every common 7th chord with smooth voice leading.

Video lesson by Jason Zac · Intermediate · 25 min

Can't see the video? Watch it on YouTube.

What this lesson teaches

In this jazz piano lesson, Jason Zac shows how to voice 7th chords the way working pianists usually do: the right hand plays just two notes, the 3rd and the 7th (the shell), and the left hand plays the root and the 5th. It suits anyone who knows basic 7th chords and wants a usable, uncluttered sound that leaves the right hand free to improvise. Everything stays in the key signature of G major / E minor (one sharp).

Building a shell voicing

Take Am7, spelled A C E G. Move the root (A) and the 5th (E) to the left hand. That leaves C and G, the 3rd and 7th, for the right hand. You can play them as 3-7 (C below G) or invert them as 7-3 (G below C). Both work, in many registers, and sound far clearer than a full four-note block played low.

The same rule works for D7 (D F# A C): left hand D and A, right hand F# and C, or C and F#.

The chord progression

The loop is a major 2-5-1 in G, followed by a minor 2-5-1 in the relative minor, E minor, and a secondary dominant that leads back to the start:

1. Am7 (ii) – D7 (V) – Gmaj7 (I)
2. Cmaj7 (IV of G)
3. F#m7b5 (half-diminished ii of E minor) – B7 (V) – Em7 (i)
4. E7, the secondary dominant (V of Am7), which resolves back to Am7

Most of these chords move down a fifth around the circle of fifths, which is why the shells connect so easily.

Voice leading the shells

Start with Am7 as C-G. Going to D7, the C stays (it is the 3rd of Am7 and the 7th of D7) and G slides down to F#, giving C-F#. For Gmaj7, F# stays and C drops to B (B-F#). For Cmaj7, B stays and F# drops to E (B-E). For F#m7b5, E stays and B drops to A (A-E). For B7, A stays and E drops to D# (A-D#). Then come Em7 (G-D) and E7 (G#-D), leading back to Am7.

Notice the hand keeps drifting downward, mostly by a semitone or a tone. When you return to Am7, don't jump back up: continue with the other shape, G-C. Playing the loop twice this way, in two laps, gives you both the 3-7 and 7-3 shapes of all eight chords.

Rhythms to practise with

• Block chords in the right hand while the left hand toggles between root and 5th.
• Cascading the two shell notes on sixteenth-note counts (1 e and a).
• A pop or salsa-like tresillo-style pattern that pushes the off-beats.
• The Charleston: hit on beat 1 and the and of 2.
• The displaced Charleston: start on the and of 1 and land on beat 3. Alternating normal and displaced bars creates tension and release.
• A busy sixteenth-note pattern that both strikes and breaks the chord from bottom to top.

Tritone substitution

Any dominant 7th can be replaced by the dominant 7th a tritone away, while the right-hand shell stays exactly the same, because the 3rd of one chord is the 7th of the other. Only the left-hand root changes:

• D7 (F# and C) becomes Ab7 (C and Gb, the same keys)
• B7 (A and D#) becomes F7 (A and Eb)
• E7 (G# and D) becomes Bb7 (D and Ab)

How to practise

While playing, sing the roots, then the chord names, then the shell notes themselves. Write the shapes out by hand, and transpose the whole exercise to other keys on your own.

Questions about this lesson

What are the notes in a shell voicing?

A shell voicing uses the 3rd and 7th of the chord, the notes that define its quality. For Am7 that is C and G; for D7 it is F# and C.

Why do the shells voice-lead so smoothly in a 2-5-1?

When chords move down a fifth, the 3rd of one chord often becomes the 7th of the next, so that note can stay while the other note moves down a semitone or tone. For example, C is the 3rd of Am7 and the 7th of D7.

How does tritone substitution work with shell voicings?

A dominant 7th and the dominant 7th a tritone away share the same 3rd and 7th, just swapped. So D7 and Ab7 use the same right-hand keys, and only the left-hand root changes.

What should the left hand play?

Throughout this exercise the left hand plays the root and 5th of each chord, either together or toggling between them to keep the rhythm moving.

Practise it

• Jazz Harmony LabPractise jazz shell voicings, guide-tone movement and comping through changing keys.
• Voicing RoomA hands-on lesson room for piano chord voicings.
• Piano classes at Nathaniel School of MusicLive online or in Bangalore, with a teacher.
• All free music apps40 practice tools for harmony, rhythm, ear training and more.

Related lessons

• How to Voice the 2-5-1 Jazz Chord Progression on PianoTo voice a 2-5-1 on piano, play the root and fifth of each seventh chord in the left hand and the third and seventh (as 3-7 or 7-3) in the right hand, choosing whichever order lets the right hand move by the smallest step.
• Groovy Latin Piano Over the 2-5-1 Jazz Progression (16th-Note Pattern)To play a Latin groove over a 2-5-1, voice Am7, D7 and Gmaj7 with the root and fifth in the left hand and the 3rd and 7th in the right hand, then let the left hand keep a steady pulse while the right hand plays a syncopated 16th-note pattern.
• 12 Bar Blues Piano for Beginners (Sing and Play Along)The 12 bar blues uses only the I, IV and V major chords (C, F and G in the key of C), arranged in three four-bar lines: I-I-I-I, IV-IV-I-I and V-IV-I-I, with optional IV in bar 2 and a V turnaround in the final bar.
• The 2-5-1 Jazz Piano Chord Progression ExplainedA 2-5-1 (ii-V-I) progression takes the chords on the 2nd, 5th and 1st degrees of a scale; in G major that is Am7 (A C E G), D7 (D F# A C) and Gmaj7 (G B D F#), and in G minor it becomes Am7b5 (A C Eb G), D7 and Gm7 (G Bb D F).