Interactive piano piece
Learn 160 Eight-Measure Exercises No. 9, Op. 821
A Vivace in 6/8 and F major that demands fast compound-time agility from both hands simultaneously — one of the most energetic entries in the early Op. 821 sequence. Slow the Vivace to 50% on the practice desk and confirm both hands lock together rhythmically before raising the tempo — compound-time coordination between hands is the specific demand No. 9 adds over No. 4.
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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
Compound time returns — but now both hands are fully active.
Carl Czerny — trained by Beethoven, teacher of Liszt — designed the 160 Eight-Measure Exercises, Op. 821, to revisit technical frameworks in new keys with added difficulty, creating a spiral curriculum where the student encounters familiar territory at higher demand. No. 4 introduced 6/8 compound duple in C major; No. 9 returns to the same metre and Vivace tempo but moves to F major and makes both hands equally active.
The additional left-hand independence in No. 9 changes the exercise fundamentally: where No. 4 was primarily a right-hand compound-time drill, No. 9 demands that both hands synchronise triplet groupings at speed without either hand drifting into simple duple. The eight-measure format leaves no room to lose the compound feel mid-exercise and recover gracefully.
Practice path
Lock both hands together at slow tempo before raising speed.
Practice the left hand alone at 55% until the 6/8 grouping is fully automatic. Then practice the right hand alone. Only when both hands feel the two-beat compound pulse independently should you combine them — starting at 60% and raising by 5% increments. If either hand reverts to feeling six beats, stop and return to the two-tap body exercise before continuing.
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=2072).
MIDI source: Mutopia Project (https://www.mutopiaproject.org/cgibin/piece-info.cgi?id=2072). 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 does Czerny Op. 821 No. 9 compare to No. 4?
Both are Vivace in 6/8 but No. 9 moves from C major to F major and increases the demands on the left hand, which carries more independent motion. It is the natural next step after mastering No. 4.
02What does Czerny Op. 821 No. 9 develop?
Fast compound-duple coordination in F major, training both hands to synchronise triplet groupings at Vivace while maintaining the light, forward-moving character of 6/8 rather than plodding through six counts.
How to use this V1
Synchronisation is the specific skill here.
The coordination challenge in No. 9 is not just speed — it is keeping both hands in the same compound rhythmic framework simultaneously. At any tempo, if the hands sound slightly offset or if the lilt disappears, slow down and re-establish the shared two-beat pulse before continuing. Section-loop the most rhythmically unstable bar until both hands navigate it cleanly. Wait-for-note mode is useful for confirming that the compound triplet groupings align exactly between hands.