A shell voicing is three notes: the root, the third and the seventh of a chord. A rootless voicing drops the root as well, and often the fifth, and builds on the third or the seventh instead. Both keep the notes that define the chord’s quality, so the harmony stays clear with fewer notes and room is left for a bass player, a melody or a soloist.
\nIn a seventh chord the root gives the name, and the third and seventh give the character. Dm7 is D F A C. Its third, F, sits a minor third above the root, and its seventh, C, sits a minor seventh above it. Raise the F to F sharp and the chord becomes D7, a dominant seventh, over the same root. The fifth, A, is the note that can usually go without changing the quality.
\n| Chord | Root | Third | Seventh | Quality set by the third and seventh |
|---|---|---|---|---|
| Dm7 | D | F | C | minor third, minor seventh |
| G7 | G | B | F | major third, minor seventh |
| Cmaj7 | C | E | B | major third, major seventh |
The two notes that matter most in G7 are B and F, and they sit a tritone apart. That tritone is the tense core of the dominant chord, and it is a large part of why the chord wants to resolve. The seventh chords article covers that resolution in more detail. The seventh of G7 falls to the third of the tonic, and the third of G7 holds as the seventh of the tonic. Those are the moves a voicing needs to keep audible.
\nA shell is compact. Its three notes fit in one hand without a stretch, and they leave the middle of the keyboard free for other parts. The first chord below is D3, F3, C4: root, third and seventh of Dm7. The second is G2, F3, B3, which holds the same kind of stack for G7, with the seventh placed below the third. The third is C3, E3, B3, the shell of Cmaj7.
\nKeep the third of a left-hand shell at or above about C3. Below that, close intervals blur together, and the root is the only note that should sit that low.
\nShells are most useful when someone else plays the melody or the bass. A pianist comping for a singer or a soloist can play shells through a whole chorus, moving only the upper two notes when a chord changes. The shape stays put, and the harmony still changes under it.
\nTake away the root and the fifth and each chord leaves two notes, its third and seventh. These guide tones are the most useful notes to follow through a progression, because in ii–V–I they move by half step or stay in place.
\nFrom Dm7 to G7, the seventh of Dm7, C, falls a half step to the third of G7, B, while the third of Dm7, F, stays put as the seventh of G7. From G7 to Cmaj7, the seventh of G7, F, falls a half step to the third of Cmaj7, E, and the third of G7, B, stays put as the seventh of Cmaj7.
\nThose three chords are Dm7 (F and C), G7 (F and B) and Cmaj7 (E and B). The upper note falls from C to B and holds. The lower note holds F and then falls to E. Two voices, each moving by step or not at all, carry the whole progression.
\nA rootless voicing leaves out the root altogether. It is the usual choice when a bass player is covering the root, and it lets the pianist place the upper extensions where they sound best. Teachers name these types differently, so treat the following as a working definition. Type A puts the third at the bottom and stacks the fifth, seventh and ninth above it. Type B puts the seventh at the bottom and stacks the ninth, third and fifth above it.
\nOn Dm7, Type A is F, A, C, E: third, fifth, seventh and ninth. On G7, Type B is F, A, B, D: seventh, ninth, third and fifth. On Cmaj7, Type A is E, G, B, D. The ninth in each case is the colour that a shell does not have, and the extensions article explains where such notes fit.
\nThis is Dm7 in Type A, G7 in Type B and Cmaj7 in Type A, in the key of C. The top voice moves E4 to D4 and then holds. The lower notes move by half and whole steps: C4 to B3 and E4 to D4 in the first move, then F3 to E3 and A3 to G3 in the second. Over Dm7 the E is the ninth, so the first chord is a Dm9 without its root. Over Cmaj7 the D is the ninth, so the last is a Cmaj9 without its root.
\nA drop-2 voicing begins with a close-position chord, four notes within one octave, and moves the second note from the top down an octave. The result spans more than an octave and opens the sound. For Cmaj7 the close position is C4, E4, G4, B4. The second note from the top is G4, so dropping it gives G3, C4, E4, B4, and the fifth now sits at the bottom.
\nDrop-2 voicings are usually built for the right hand, with a bass note or a left-hand shell below them. The open spacing keeps the upper notes distinct, which matters when a melody is also sounding in the same range.
\nSpacing decides how clear a voicing sounds. Close intervals in the bass register run together, so the same two notes that are distinct an octave apart can sound like a single smear a second apart. Wide spacing in the upper register can make a chord thin. The examples in this article keep the third and seventh at about C3 or above, with a root allowed lower only where it is the bass, and place those notes where they can be heard separately. When a voicing sounds muddy, the first fix is usually to move the lowest note up an octave or to remove one note, not to add more.
\nThe table below sets the voicings side by side for the three chords, listed from the bottom up.
\n| Voicing | Stack from the bottom | Dm7 | G7 | Cmaj7 |
|---|---|---|---|---|
| Shell | root, third, seventh | D F C | G B F | C E B |
| Rootless Type A | third, fifth, seventh, ninth | F A C E | B D F A | E G B D |
| Rootless Type B | seventh, ninth, third, fifth | C E F A | F A B D | B D E G |
| Drop 2 | close position, second note dropped an octave | A D F C | D G B F | G C E B |
The same notes can name two chords. F, A, C, E is Dm9 without its root, and it is also Fmaj7. E, G, B, D is Cmaj9 without its root, and it is also Em7. A voicing on its own does not settle the name. The bass note or the surrounding chords decide it, and a player who wants the chord to be heard as intended has to put the root, or the right bass line, under the voicing.
\nA second error is stacking too much. A left-hand voicing with root, third, fifth and seventh is heavier than the chord needs, and it crowds the register where the bass and the melody sit. When a bass player is present, the pianist’s job is usually the third, the seventh and one or two upper colours.
\nFinally, the type names are not standard. A book may call a stack Type B that another calls Type A. Check the notes, not the label.
\nPlay the guide-tone line from the example, as in the ii-V-I progression, with the left hand alone: two notes per chord, listening only to the half-step falls. Then add the Type A and Type B voicings in the right hand while keeping the guide tones in the left. Finally, move the whole pattern up a perfect fourth to Gm7, C7 and Fmaj7. Every note should move by the same interval, and the top line should still move by step. If it jumps, the voicing is wrong for the progression, whatever it is called.
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