Allegro in C for clavier (doubtful), K. 650
ヴォルフガング・アマデウス・モーツァルト作
Mozart’s Allegro in C for clavier (K. 650) is a short, single-movement keyboard piece of doubtful authenticity, transmitted in a form that is likely a keyboard reduction of an orchestral Allegro in C major. The dating is uncertain, but is generally placed in the late 1760s, when Mozart was still in his early teens [1].
Mozart's Life at the Time
In the late 1760s Mozart was moving between Salzburg and Vienna with his family, absorbing a wide range of styles while still writing in concise, entertainment-oriented genres for court and domestic music-making [1]. Because K. 650 is of doubtful authorship and its place of origin is not securely documented, it is best understood as part of the broader keyboard-and-orchestral Allegro repertory associated with the adolescent Mozart rather than a firmly attributable “biographical statement” in miniature [1].
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Musical Character
What survives under K. 650 is an Allegro in C major for clavier, notated as a complete, extant movement [1]. The Mozart scholar-site catalogue suggests that the keyboard writing may represent a reduction—compressing what could originally have been orchestral textures into a playable two-hand format—so the musical surface is likely geared toward clear harmonic rhythm, bright C-major cadence patterns, and the sort of straightforward periodic phrasing typical of quick opening movements [1]. Heard in that light, the piece fits (at least stylistically) with the young Mozart’s training in energetic, triadic themes and rapid passagework, even if its exact authorship remains unresolved.
[1] Internationale Stiftung Mozarteum (Köchel Verzeichnis): KV 650, Allegro in C for clavier — authenticity, transmission, and dating summary.