Hands Separate · Theory

How to Practise Slow Practice Counterpoint Rhythm Training Memorisation

Hands-separate practice is usually explained as "because the hands are not ready". More precisely:

It reduces the amount of information that must be handled at once.

Three ways to "separate"

Level	Separated by	Applies to
1 hands	left / right	keyboard instruments
2 parts	each melodic line (see [[concept:counterpoint\	counterpoint]])
3 layers	melody / accompaniment / bass	homophonic textures

Level 2 differs from level 1: separating hands divides by limb, separating parts by line — and in polyphonic music one hand often carries two lines, each of which also deserves separate practice.

So part practice is closer to the music's own structure — it divides by voice, not by body.

The key point: combining is not addition

The most easily misread point here:

Combining is a new task, not something that happens automatically once each hand is ready.

Premise	Result
both hands well practised	combining may still collapse
both hands ready + practising the combination itself	it works

Why: combining means doing two things at once, a new coordination task — like "can draw a circle with the left hand and a square with the right" not implying "can do both simultaneously".

So treat combining as an independent task:

Step	Do this
1	each hand practised to the point of no errors
2	combine slowly (much slower than the single-hand tempo)
3	raise the tempo gradually, back to the whole piece

The slowness of step 2 is easily missed: many people combine at the original tempo as soon as one hand is ready — which almost guarantees errors. The combining tempo should be slower than either hand's, because more information is being processed.

A common wrong order

Wrong practice	Problem
try combining fast first, then separate when it collapses	repeating errors (see [[concept:practice-method\
practise hands separately only, never the combination	combining seriously for the first time just before a performance
watching only the difficult part when combining	the other hand loses control

The first is the commonest: "trying" it once before practising gives a demonstration of the wrong action.

Diagram: separating and combining are two things

Listen: two independent lines

The object of part practice is independent lines. This site cannot play two voices, but interval lets you feel the relation of two lines at one instant — each line continuous on its own, harmony only when combined, which is the aural aim of part practice.

Common misconceptions

"Hands separate is for hand readiness." More precisely, it reduces the information to be processed at once.
"Once both hands are ready, combining follows." Combining is a new task, practised separately and **slower

than either hand**.

"Part practice is hands separate." They differ: one divides by limb, the other by musical line. In

polyphony one hand may carry two lines.

"Try it fast first, then separate." That is repeating errors — a demonstration of the wrong action.

Start slowly instead. :::

Listen in the library

Piano Sonata No.1 in F minor, Op.6: 1. Allegro con fuocoC16:36Scriabin's Piano Sonata No.1 gives the hands very different work, where hands-separate practice is plainly necessaryDetailsOde to JoyC10:37The Ode of Joy is simple enough to test whether hands still fail on combining after being learnt separatelyDetailsScales, Arpeggios, and CadencesC13:22Scale and cadence exercises suit the standard sequence of separate hands, then slow combinationDetails

All tracks from midicn-lib — inline badge is the license tier (C1 commercial / C2 non-commercial / C3 study only).

Sources

分手练习的作用为降低同时处理的信息量；合手本身是独立任务，须单独练习与降速，为通行乐器教学表述
分声部练习（复调作品按声部练习）的必要性源自各声部的独立性，为通行表述

Used for fact-checking only; all prose is original.

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