Rondo for Piano in F major (fragment), K. 590b
ヴォルフガング・アマデウス・モーツァルト作
Mozart’s Rondo for Piano in F major (fragment), K. 590b, is a short surviving torso from his Vienna years, usually dated to 1787 (or, more cautiously, to the late 1780s). Preserved only in incomplete form, it offers a glimpse of the fluent keyboard style Mozart cultivated in his early thirties—poised, songful, and geared toward the intimate sound-world of the fortepiano.
What Is Known
Only a brief portion of this F-major rondo survives, transmitted as an incomplete keyboard manuscript and generally described in catalogues as a sonata movement / rondo fragment for solo piano [1][2]. Modern reference listings place it in Vienna and usually date it to around 1787–1789 [3]. No authoritative “completion” has entered standard circulation; performers generally meet the piece, when at all, as a miniature fragment.
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The work belongs to the same late-Vienna keyboard world as Mozart’s more finished piano pieces of the period—music shaped by clear phrase structure, idiomatic right-hand cantabile (singing line), and light, articulate accompaniment patterns suited to the fortepiano.
Musical Content
What remains suggests a rondo-like texture: a compact, tuneful principal idea in F major with periodic phrasing, written in a bright, uncomplicated keyboard idiom rather than the more experimental, harmonically searching manner of some late works. Its brevity (often estimated at well under a minute in performance) makes large-scale form hard to prove from the page alone, yet the opening gestures read like the start of a recurring refrain—music that would naturally invite contrasting episodes before returning home to F major [2].
[1] IMSLP – "Piano Sonata in F major, K.Anh.30/590b" (score and basic work record; notes its incomplete status).
[2] PianoLibrary.org – "Sonata movement in F major, KV Anh. 30/590b" (summary, dating range, and performance-length estimate).
[3] Wikipedia – Köchel catalogue table entry listing K. 590b (Rondo for Piano in F, fragment) with Vienna dating range.