Piano Sonata in C major (lost), K. 33f
ヴォルフガング・アマデウス・モーツァルト作
Mozart’s Piano Sonata in C major (K. 33f) is a childhood keyboard work known today only through catalogue documentation. The International Mozarteum Foundation lists it as an authentic but lost sonata for clavier, probably dating from Mozart’s Salzburg years between 1769 and 1774.
Mozart’s Life at the Time
Wolfgang Amadeus Mozart (1756–1791) was still in the thick of his formative Salzburg training when this Sonata in C for clavier is thought to have been written. The Köchel entry places the work in Salzburg and dates it broadly to 1769–1774, when Mozart was a pre-teen to early teenager, absorbing Italianate melody, German keyboard craft, and the practical demands of domestic music-making. During these years, Leopold Mozart continued to supervise his son’s studies and professional prospects, while Salzburg’s court and cathedral environment remained the family’s musical center of gravity.[1]
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Musical Character
Because no extant score is available, K. 33f cannot be described in terms of themes, texture, or movement plan with any confidence. What can be said is limited but concrete: the work is identified as a completed Sonata in C major for solo clavier (a period catch-all that can encompass harpsichord and early piano), and it belongs to the small group of Mozart’s early keyboard sonatas that are now lost.[1] In developmental terms, its very designation as a “sonata” suggests that Mozart was already practicing large-scale keyboard continuity—an important step on the path toward the more securely transmitted sonatas of the mid-1770s (such as the set K. 279–284).
[1] International Mozarteum Foundation (Köchel Verzeichnis): KV 33f, Sonata in C for clavier — status, key, instrumentation, and dating.