Piano Piece in C major (Fragment), K. 656
de Wolfgang Amadeus Mozart
Mozart’s Piano piece in C (fragment), K. 656, is an uncompleted keyboard draft transmitted in autograph and dated to Salzburg in 1771, when the composer was 15. Though slight in scale, it offers a telling glimpse of the teenage Mozart thinking in “sonata” gestures—clear tonal rhetoric, balanced phrases, and a forward-driving harmonic plan—without carrying the idea to a finished movement.
What Is Known
K. 656 survives as an extant, autograph keyboard fragment, classified by the International Mozarteum Foundation as an uncompleted work and dated to Salzburg, 1771.[1] Modern reference catalogues therefore treat it less as a standalone “piano miniature” than as a sonata-movement draft (Sonatensatz), a label also reflected by IMSLP’s presentation of the piece and its reliance on the Neue Mozart-Ausgabe keyboard-sonata volume for the text.[2]
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The Mozarteum’s entry identifies the scoring simply as clavier (clav), which in 1771 may imply harpsichord or organ as readily as a later fortepiano.[1] That ambiguity helps explain why the work is sometimes loosely described as a “piano piece,” even though its original practical context (domestic keyboard, church organ loft, or compositional exercise) is not firmly documented.
Musical Content
What survives reads as the opening of a C-major sonata-style movement: a compact, period-typical texture with right-hand melody and left-hand accompaniment patterns, and a harmonic trajectory that suggests an exposition in progress rather than a self-contained liturgical verse.[2] Even in fragmentary form, the writing points toward Mozart’s developing command—at age fifteen—of concise thematic presentation and tonal “plot,” the same skill that would soon underpin the more fully realized Salzburg keyboard works of the early 1770s.[1]
[1] International Mozarteum Foundation (Köchel-Verzeichnis): work entry for KV 656 “Piano piece in C” (fragment) — dating, status, and instrumentation.
[2] IMSLP: “Sonatensatz in C major, K.656” — reference presentation and NMA source information for the fragment.