Movement to a Piano Concerto in E-flat (in conjunction with K. 491), K. 537c
par Wolfgang Amadeus Mozart
Mozart’s Movement to a Piano Concerto in E-flat (K. 537c) is a surviving fragment—specifically, the opening of a slow movement—for piano and orchestra, written in Vienna in 1786, when the composer was 30. Closely associated in the sources with the Piano Concerto No. 24 in C minor, K. 491, it offers a brief glimpse of Mozart’s concerto lyricism in E♭ major without preserving enough material to establish a complete, performable movement.
Background and Context
In Vienna in 1786, Wolfgang Amadeus Mozart (1756–1791) was at the height of his piano-concerto mastery, writing for the city’s public concerts and his own appearances as soloist. Around this period he entered the Piano Concerto in C minor, K. 491 into his thematic catalogue (March 1786), a work whose breadth and instrumental color mark it as one of his most ambitious concertos.[2]
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K. 537c survives only as the beginning of a slow movement in E♭ major for “clavier and orchestra,” preserved among concerto fragments in the Neue Mozart-Ausgabe (NMA), where it is explicitly indexed as such and cross-referenced to earlier catalog designations linking it with K. 491.[1] The musical and documentary relationship—whether it was sketched as an alternative Larghetto for K. 491, a trial opening, or a separate concerto project later connected with that concerto—remains a matter of scholarly inference rather than a securely documented commission or premiere.[1]
Musical Character
What is transmitted is not a complete movement but an incipit-like stretch: enough to suggest a slow-movement sound world—E♭ major as a cantabile “relief” key against the gravity of C minor—but not enough to map a full form (such as ternary, variation, or sonata-allegro slow movement).[1]
Even in fragmentary state, the choice of E♭ major invites comparison with Mozart’s practice in K. 491 itself, whose central movement stands apart from the outer movements’ C-minor drama by turning toward a more serene lyricism (albeit in a different key in the finished concerto).[3]) K. 537c may reflect Mozart testing precisely that kind of tonal and expressive contrast—piano cantilena supported by discreet orchestral response—before abandoning or repurposing the idea.[1]
Place in the Catalog
In the NMA’s piano-concerto volume, K. 537c appears among late-concerto appendix fragments, positioned not as a repertory work but as a surviving workspace document from Mozart’s Viennese concerto production.[1] Read alongside K. 491, it underlines how Mozart’s concerto “finished products” could be preceded by alternate starts and exploratory slow-movement sketches—ideas that sometimes remain only as a few preserved pages.[1]
[1] Digital Mozart Edition (Mozarteum): NMA V/15/8 table of contents listing “Beginning of a slow movement in E flat … K. 537c (Anh. 62; 491a)”
[2] Boston Symphony Orchestra program note: contextual dating of K. 488 and K. 491 in Mozart’s 1784–1786 concerto sequence (entry into thematic catalogue)
[3] Wikipedia: Piano Concerto No. 24 in C minor, K. 491 (overview and movement/key information for contextual comparison)