Rondo (fragment) and lost piece for “Pianoforte de l’harmonie parfaite” (doubtful), K. 684
ヴォルフガング・アマデウス・モーツァルト作
Mozart’s Rondo (fragment) and a reported lost keyboard piece for the so‑called “Pianoforte de l’harmonie parfaite” are catalogued together as K. 684 (1783) and are commonly treated as works of doubtful authenticity. What survives is incomplete, and the attribution to Wolfgang Amadeus Mozart (1756–1791) remains uncertain.
What Is Known
K. 684 refers to two keyboard items linked to an instrument described as the “Pianoforte de l’harmonie parfaite”: an extant Rondo fragment (K. 684,01) and a lost piece (K. 684,02). Both are explicitly listed as of doubtful authenticity in the Mozarteum’s Köchel database, with dating given as Linz, 1783 (to November 1783); no key is supplied in that catalog entry, and the instrumentation is simply keyboard (clavier).[1][2][3]
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In late 1783 Mozart was traveling between Salzburg and Vienna and spent time in Linz en route; the Köchel entry’s Linz dating therefore sits plausibly within his movements that year, even if it does not, by itself, secure the authorship of the music transmitted under K. 684.[1]
Musical Content
The surviving material is identified only as a Rondo fragment for solo keyboard, without publicly displayed thematic incipit or detailed musical description in the readily available catalog record. Given that limitation, it can only be said that the source preserves an unfinished rondo-like idea (a recurring principal strain with intervening episodes would be the expected plan), but no secure account of its key, length, or formal completion can be drawn from the catalog description alone.[2]
[1] Mozarteum Köchel Verzeichnis: K. 684,01–02 — Two pieces for the “Pianoforte de l’harmonie parfaite” (status, dating, instrumentation, workparts)
[2] Mozarteum Köchel Verzeichnis: K. 684,01 — Rondo for the “Pianoforte de l’harmonie parfaite” (fragment), doubtful authenticity
[3] Mozarteum Köchel Verzeichnis: K. 684,02 — Piece for the “Pianoforte de l’harmonie parfaite” (lost), doubtful authenticity
[4] Wikipedia: Mozart symphonies of spurious or doubtful authenticity (editor-requested contextual reference page on doubtful attributions)