- Köchel Number
- K9 569a | K6 569a
- Genre
- Piano Music
- Form
- Piano Sonatas
- Key
- B Flat Major
- Date
- 1787–1789
- Place
- Vienna
- Age
- 31
Mozart’s Sonata movement for clavier in B♭ major (fragment), K. 569a, is an unfinished remnant from his Vienna years, dating broadly from December 1787 to February 1789. Preserved on a single autograph leaf, it offers a brief glimpse of the clear, cantabile keyboard style Mozart was cultivating in his early thirties.
Background and Context
In Vienna, in the period from December 1787 to February 1789, Wolfgang Amadeus Mozart (1756–1791) was balancing the immediate aftermath of Don Giovanni with a busy life of composing, teaching, and publishing in the imperial capital [1]. K. 569a belongs to this late-Viennese keyboard world, yet survives only as an uncompleted work: an autograph fragment written on a single leaf [1]. It is therefore usually treated not as a full “sonata,” but as a sonata-type movement that Mozart did not carry through to completion.
Musical Character
What remains suggests a conventional Classical opening movement in B♭ major—music that speaks in balanced phrases, with a fluent right-hand melody supported by left-hand accompaniment patterns typical of Mozart’s mature piano writing [1]. The fragment’s placement among the keyboard sonatas in modern cataloguing and editions points to a sonata-allegro ambition (contrasting ideas and the expectation of a modulatory middle), even if the surviving page does not allow the full design to be reconstructed with confidence [1]. Heard alongside Mozart’s complete late B♭-major keyboard works, it reads as a small but telling study in clarity: bright key, direct thematic profile, and an emphasis on singable line over display.
Sources
[1] Internationale Stiftung Mozarteum (Köchel Verzeichnis) — KV 569a work entry: status, dating (Vienna, 12.1787–02.1789), autograph fragment details (1 leaf), key and instrumentation.