Interactive piano piece
Learn The Well-Tempered Clavier I, Prelude in E minor
A relentlessly active E minor prelude whose two independent voices maintain a near-constant sixteenth-note drive across 41 bars. The interactive score separates the two simultaneous textures visually so you can focus on either the melody or the accompaniment, and loop any section at the tempo that keeps both hands honest.
Browser MIDI check pending
Loading score...
Press Play for the full piece, or choose Opening and switch to Wait for note for guided right-hand practice.
About the piece
Two characters in one hand.
The Prelude in E minor (BWV 855) from WTC Book I does something unusual in the collection: the right hand plays two completely different musical ideas simultaneously — a singing, expressive melody in the upper fingers and a rapid sixteenth-note accompaniment in the lower fingers — while the left hand maintains an independent bass line. The result is effectively a piece for three voices played by two hands, an early example of what pianists call 'layered texture.'
Bach wrote this kind of textural layering to train the ear's ability to separate simultaneous voices — the same skill that makes counterpoint intelligible. E minor gives the piece a quality of melancholy restlessness: the melody above seems to pull away from the agitated motion below it, the two registers occupying different emotional worlds that never quite reconcile.
Practice path
Separate the layers, then reunite them.
The right hand's task — sustaining a legato melody while playing rapid notes with the lower fingers — is one of the more demanding technical challenges in the WTC preludes. Begin by practicing only the right hand's melody (upper notes only, held), then only the accompaniment sixteenths, before combining them. The goal is to hear and feel them as two distinct voices, not as a single rapid figure with some notes held longer.
Score basis: Generated MusicXML from Mutopia MIDI. Public domain composition; Public Domain (CC0) — Mutopia; MusicXML generated for Pianodemy. Attribution: Mutopia Project (https://www.mutopiaproject.org/cgibin/piece-info.cgi?id=545).
MIDI source: Mutopia Project (https://www.mutopiaproject.org/cgibin/piece-info.cgi?id=545). Public Domain (CC0) — Mutopia.
Questions
Before you practice.
Short answers for learners and for searchers deciding whether this is the right version to start with.
01How hard is Bach WTC Prelude in E minor BWV 855?
It sits at solid intermediate level. The non-stop sixteenth-note texture in both hands simultaneously demands stamina, voice independence, and finger evenness that beginners have not yet developed — but dedicated intermediate students can master it within a few focused weeks.
02How many notes are in BWV 855?
The E minor prelude contains over 1,100 notes across 41 bars, making it one of the most note-dense WTC I preludes. This density is what makes practicing at a slow, controlled tempo so essential before reaching performance speed.
How to use this V1
Two voices in one hand — train them separately.
Use the loop tool on the first eight bars at 50% tempo and deliberately over-exaggerate the melody's legato — hold each note slightly longer than written until your hand learns the independence. Once the hand can produce two distinct tones simultaneously, the expressive character of the prelude becomes fully available.