Piano Sonata in B♭ major (lost), K. 33e
av Wolfgang Amadeus Mozart
Mozart’s Piano Sonata in B♭ major (K. 33e) is a putative juvenile keyboard work, reportedly from Salzburg in 1766, when he was ten. No score is known to survive, and modern reference catalogues treat the work as lost and of doubtful authenticity [1] [2].
What Is Known
K. 33e is transmitted only as a catalogue entry for a Piano Sonata in B♭ major (often cross-referenced as “Anh. 200/33e”), with no surviving manuscript, early print, or independently verifiable incipit in the standard online record [2] [3]. Accordingly, it is best regarded as a lost work whose attribution to Wolfgang Amadeus Mozart (1756–1791) remains uncertain.
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If the traditional dating “Salzburg, 1766” is correct, the sonata would belong to the period immediately after the Mozart family’s long Western European tour (1763–1766), when the ten-year-old composer was rapidly consolidating his command of the galant keyboard idiom—short phrases, clear cadences, and light textures suited to domestic performance. Yet without a source, neither the sonata’s scale (sonatina-like or multi-movement) nor its stylistic profile can be securely placed within Mozart’s early keyboard output.
Musical Content
No musical text is extant; for that reason, the sonata’s themes, formal design, and even movement count cannot be described from primary evidence. At most, the catalogue title suggests a conventional mid-1760s sonata plan for keyboard (a fast opening movement being the most likely anchor), but any further characterization would be speculative.
[1] Musicalics: worklist entry noting “Sonata: piano • K. 33e/A.200 (1766)” (useful as a modern reference summary).
[2] Köchel catalogue (Wikipedia mirror): entry indicating “K033e … Piano Sonata … (fragment; lost) … Salzburg … age 10.”
[3] PianoLibrary.org: “Incipits of lost works” page listing “Sonata in B-flat major, KV Anh. 200/33e.”
[4] Wikipedia: overview page on Mozart works of spurious/doubtful authenticity (context for how doubtful attributions are treated in reference literature).