Interactive piano piece
Learn 160 Eight-Measure Exercises No. 3, Op. 821
An Allegretto in C major that zeroes in on smooth legato connections and clean passing-note figures, demanding careful thumb placement at every position shift. The section loop on the practice desk is especially useful here — isolating the two or three bars containing each thumb crossover lets you drill the transition without resetting the entire piece each time.
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Press Play for the full piece, or choose Opening and switch to Wait for note for guided right-hand practice.
About the piece
The bump in the scale — and how Czerny fixed it in eight bars.
Carl Czerny was Beethoven's most diligent pupil and went on to become the most published piano pedagogue of the nineteenth century, teaching Liszt and shaping generations of pianists through hundreds of graded exercise volumes. His 160 Eight-Measure Exercises, Op. 821, compress one technical problem per piece into the smallest possible format, making them a uniquely efficient diagnostic tool for teachers and students alike.
No. 3 targets one of the most persistent stumbling blocks in early piano study: the thumb crossover in scalar passages. At Allegretto, the passing-note figures demand careful thumb placement beneath the hand before the preceding note is released — if the thumb arrives late, a bump appears in the phrase that becomes more obvious, not less, as tempo rises. Eight measures is exactly enough space to expose the problem and begin to fix it.
Practice path
Place the thumb silently before you need it.
Isolate each thumb crossover moment: hold the note before the crossover, then silently place the thumb on its key before releasing. Repeat this in slow motion until the thumb is always pre-positioned. Only then play through in tempo — the crossover should now feel like a natural weight shift rather than a scramble.
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=2062).
MIDI source: Mutopia Project (https://www.mutopiaproject.org/cgibin/piece-info.cgi?id=2062). 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.
01What is the focus of Czerny Op. 821 No. 3?
The exercise trains thumb-under technique and smooth legato phrasing in passing-note scalar passages. At Allegretto in 4/4, the required smoothness is already demanding before the tempo is raised.
02How many notes are in Czerny Op. 821 No. 3?
The MIDI conversion counts around 209 note events across 8 measures, making it the most note-dense of the early Op. 821 exercises — a sign of how tightly packed Czerny's right-hand writing is.
How to use this V1
The bump is a timing problem, not a strength problem.
Students often press harder when the thumb crossover breaks down, trying to force smoothness with more effort. This makes it worse. At 50% tempo, play through and count how many crossovers are fully smooth. Mark any that are not, then practice just those crossovers in isolation using the section loop before attempting the full exercise. At 80%, confirm the smooth ones are still smooth — sometimes speed reveals new problems.