Jacquin family. (Emilian) Gottfried von Jacquin (b. 1767; d. Vienna, 24 Jan. 1792) worked at the court chancellery in Vienna; his friendship with Mozart probably dates from before 1783. It seems likely that Mozart helped Jacquin, an amateur composer and singer, with several compositions, or at least that he composed some works jointly with him; these include the six notturni K346 and K436–9. And in 1791 Gottfried published under his name six songs, two of which were composed by Mozart: Als Luise die Briefe ihres ungetreuen Liebhabers verbrannte, K520, and Das Traumbild, K530. Mozart composed the aria Mentre ti lascio, o figlia, K513 for Gottfried; and according to Constanze Mozart's letter of 25 May 1799, Gottfried wrote the aria Io ti lascio, o cara, addio, K621a – only the violin parts are by Mozart. Gottfried's sister, Franziska (1769–1850) was a keyboard student of Mozart's; it was for her that he wrote the so-called ‘Kegelstatt’ trio for clarinet, viola and piano, K498, and the piano duet sonata K521.

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Jenamy, Victoire (b. 1749; d. 1812). French pianist, daughter of J. G. Noverre. A first-rate pianist, Jenamy, the daughter of Mozart's friend, the ballet master J. G. Noverre, commissioned from him the piano concerto K271 (January 1777).