Movement for a Clarinet Quintet in F (K. 580b)
par Wolfgang Amadeus Mozart
Mozart’s Movement for a Clarinet Quintet in F major (K. 580b) is a surviving Allegro fragment from Vienna (1789), probably connected to the same clarinet circle that produced the Clarinet Quintet in A, K. 581. Scored unusually for clarinet and basset horn with violin, viola, and cello, it offers a brief but vivid glimpse of Mozart’s late chamber style at age 33.
Background and Context
In 1789, Wolfgang Amadeus Mozart (1756–1791) was living in Vienna and writing intensely for chamber combinations even as his finances remained precarious. K. 580b—an Allegro in F major—survives only as a fragment, and its precise function is not securely documented; it is often discussed in the orbit of Mozart’s celebrated Clarinet Quintet in A major, K. 581 from the same year and the wider Viennese network of clarinet virtuosi (not least Anton Stadler, with whom Mozart collaborated closely) [1] [2]).
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What is clear from the source record is the ensemble: rather than the standard clarinet-plus-string-quartet layout, Mozart pairs clarinet with basset horn over a string trio (violin, viola, cello)—a coloristic choice that points toward the warm, blended wind writing he cultivated in late Vienna [1] [3].
Musical Character
K. 580b is not a complete movement, yet the music that survives is substantial enough to outline Mozart’s intentions. The fragment is an Allegro in F major, and modern editorial reports describe 93 complete bars, comprising essentially a full exposition and only the very beginning of a development [4].
On the page, the piece behaves like late Mozart chamber music rather than a mere sketch: the two winds operate as lyrical protagonists (often in dialogue or dovetailing phrases), while the strings do more than accompany—supplying harmonic buoyancy, inner counterpoint, and cadence articulation in a tight, conversational texture. The scoring itself shapes the character: clarinet brilliance is tempered by the basset horn’s darker, veiled timbre, so that even quick material can sound mellow and autumnal rather than overtly concertante [1].
Heard beside the luminous ease of K. 581, K. 580b feels like a side-path—yet one fully in Mozart’s late idiom, where the drama lies less in display than in the finely graded exchange of melody, color, and harmonic direction.
[1] Mozarteum Köchel Catalogue entry for K. 580b (work details, scoring, fragment status).
[2] Wikipedia: Clarinet Quintet (Mozart) — contextual reference to K. 581 and related fragmentary material.
[3] Digital Mozart Edition (NMA) PDF: *Quintets with Wind Instruments* — includes reference/illustration to the F-major quintet fragment KV Appendix 90 (580b).
[4] The Clarinet (International Clarinet Association) PDF — notes on K. 580b fragment extent (93 bars; exposition largely complete).