Locked hands, or block chords, is a piano style that harmonizes a melody with both hands moving in parallel, associated with George Shearing and Erroll Garner.
Locked Hands and Block Chords
In a locked-hands voicing, the two hands move as one unit. The right hand plays the melody as the top of a closed four-note chord, and the left hand doubles that melody note one octave below. Whatever the melody does, both hands do together: locked. George Shearing built a quintet sound out of this in the 1950s, and Erroll Garner made it the engine of his entire solo style. Done well, it sounds like an arrangement for five horns played by one pianist.
What is a locked-hands voicing?
A locked-hands voicing (sometimes called block chord style) is a way of harmonizing a melody where:
- The melody note sits on top of a closed four-note chord in the right hand.
- The left hand doubles the melody note exactly one octave below the top of the right-hand chord.
- Both hands move in parallel motion through the tune. Every melody note gets a chord, and every chord moves with the melody.
The result is a thick, full sound, five voices ringing on every beat, without the pianist having to think about voice leading note by note. The technique trades subtlety for body, which is exactly the right trade in a small group where the pianist is doubling as the harmonizer for a horn.
Cmaj7 with the melody on E
For a melody note of E (the 3rd of Cmaj7), the locked-hands voicing puts E on top of a closed Cmaj7 in the right hand, and the left hand doubles that E one octave below.
LH: E (the melody, doubled an octave below)
RH: G – B – C – E (closed Cmaj7 with E on top)
Top voice: E (the melody)
Cmaj7 locked hands with the melody on E: E4, G4, B4, C5, E5
When you move to the next melody note, the entire chord shifts in parallel. The fingering does not change. The shape does not change. You slide the whole thing up or down to track the melody.
The diatonic and chromatic approach chord
The Shearing-school refinement: when the melody moves between two chord tones, insert an approach chord on the in-between note. There are two flavors:
- Diatonic approach. Use a different diatonic chord from the same key. Over Cmaj7, a melody passing from E down to D can take a Dm7 voicing on the D.
- Chromatic approach. Fill the same E to D step with a chromatic passing E♭, and harmonize that E♭ with an E♭ diminished 7. It sits a half step above the D chord and resolves down into it, so the whole five-voice block slides by half step.
The chromatic diminished approach is the secret weapon. A diminished 7 a half step away from any target resolves into it by half step in every voice at once. Plugged into the locked-hands texture, it turns a static harmonization into something that moves.
G7 in locked hands: a five-note example
On a G7 with the melody on D (the 5th), the LH doubles the D and the RH plays a closed G7 voicing under it.
LH: D (the melody, doubled an octave below)
RH: F – G – B – D (closed G7 with D on top)
G7 locked hands with the melody on D: D4, F4, G4, B4, D5
Notice the LH note is D4 and the top of the RH is D5, exactly an octave apart. The three middle notes (F, G, B) fill in a closed G7. This is the classic Shearing block chord.
Two schools: Shearing and Garner
George Shearing codified the modern locked-hands sound in his quintet recordings of the late 1940s and 1950s. The Shearing voicing is the one described above: a closed RH chord with the LH doubling the melody an octave below. He used diatonic approach chords liberally and built whole arrangements out of the texture.
Erroll Garner used a related but more rhythmically active approach. His RH played closed block chords with the melody on top while his LH played a constant, on-the-beat strummed chord, the way a guitarist comps behind a singer. The locked-hands feel was there, but it was a rhythmic engine rather than only a textural choice.
The two approaches are blended in most modern jazz piano. Oscar Peterson, Bill Charlap and many others use locked hands as a textural option inside a broader vocabulary: eight bars of locked hands, then back to single-note lines or rootless voicings.
How to practice locked-hands voicings
Week 1: Take a slow melody: a carol, a folk tune, a hymn. Harmonize every melody note with a closed RH chord and have the LH double the top note an octave below. Do not worry about approach chords yet. Just lock the texture.
Week 2: Same tune. Insert a diatonic approach chord whenever the melody moves between two chord tones a 3rd apart. Listen for the in-between chord adding fluidity.
Week 3: Same tune. Add chromatic diminished approach chords on the chromatic passing tones. The harmonization should now sound noticeably jazzier.
Week 4: Apply the technique to a jazz standard. Pick a tune with a singable melody (Misty, Stella by Starlight, Body and Soul) and harmonize the head in locked hands. When you can play it cleanly at tempo, you have a working block-chord style.
FAQ
What is the difference between "locked hands" and "block chords"?
They are used interchangeably. Block chords describes the texture, where every melody note gets a full chord beneath it. Locked hands describes the technique, where the two hands move in parallel with the LH doubling the top voice an octave below. When pianists say one, they usually mean the other.
Should I use locked hands all the time?
No. The texture is dense, because every beat is a five-note chord. It works in short stretches of 8 to 16 bars but exhausts the listener across a whole chorus. Most pianists drop into locked hands for one section of a tune, the bridge or the second time through the head, and play single-note lines or rootless voicings the rest of the time.
Can I use locked hands in any key?
Yes, the technique transposes cleanly. The harder challenge is reading or improvising at tempo while keeping the two hands locked. Most pianists develop the skill in C, F and B♭ first, then extend to all 12 keys gradually.
What about non-jazz styles?
Block chord harmonization shows up in gospel piano, often with extended dominant approach chords, in sacred music harmonizations, and in classical chorale textures. The same principles apply. Only the harmonic vocabulary shifts to fit the style.
How does this relate to Drop 2 voicings?
Drop 2 is another way to harmonize a melody, but it is NOT locked hands. In Drop 2 the second voice from the top drops an octave, which opens the chord up. Locked hands keeps the chord closed, with no dropped voice, and instead doubles the melody an octave lower. Both harmonize the melody, and they sound very different.
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