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- K.300 Gavotte (1778, Salzburg)
- K.301 (293a) Sonata for piano and violin, in G [No.25] (1978, Manheim)
- K.302 (293b) Sonata for piano and violin, in E flat [No.26] (1978, Manheim)
- K.303 (293c) Sonata for piano and violin, in C [No.27] (1978, Manheim)
- K.304 (300c) Sonata for piano and violin, in E minor [No.28] (1978, Manheim, Paris)
- K.305 (293d) Sonata for piano and violin, in A [No.29] (1978, Paris)
- K.306 (300l) Sonata for piano and violin, in D [No.30] (1978, Paris)
- K.307 (284d) Ariette for one voice "Oiseaux, si tous les ans." with piano (1777-78, Manheim)
- K.308 (295b) Ariette for one voice "Dans un bois solitaire" with piano (1777-78, Manheim)
- K.309 (284b) Sonata for piano in C [No.7] (1777, Manheim)
- K.310 (300d) Sonata for piano in A minor [No.8] (1778, Paris)
- K.311 (284c) Sonata for piano in D [No.9] (1777, Manheim)
- K.312 (590d) Allegro to a sonata for piano, in G minor (1790/91, Vienna)
- K.313 (285c) Concerto for flute in G (1778, Manheim?)
- K.314 (285d) Concerto for oboe in C (1778, Manheim?)
- K.315 (285e) Andante for flute in C (1778, Manheim)
- K.315g Eight minuets with trio for piano (1773, Salzburg)
- K.316 (300b) Aria for soprano "Io non chiedo, eterni Dei." (1778, Paris)
- K.317 Missa in C [No.14] «Könungs-Messe» (1779, Salzburg)
- K.318 Symphony (Overture) in G [No.32] (1779, Salzburg)
- K.319 Symphony in B flat [No.33] (1779, Salzburg)
- K.320 Serenade in D [No.9] «Posthorn» (1779, Salzburg)
- K.321 Vesperae de Domenica (1779, Salzburg)
- K.322 (296a) Kyrie in E flat (fragment) (1778/79, Manheim)
- K.323 (Anh.15) Kyrie in C (1788?, Vienna)
- K.328 (317c) Church sonata in C [No.15] (1779?, Salzburg)
- K.329 (317a) Church sonata in C [No.16] (1779?, Salzburg)
- K.330 (300h) Sonata for piano in C [No.10] (1783, Vienna / Salzburg)
- K.331 (300i) Sonata for piano in A [No.11] (1783, Vienna / Salzburg)
- K.332 (300k) Sonata for piano in F [No.12] (1783, Vienna / Salzburg)
- K.333 (315c) Sonata for piano in B flat [No.13] (1783, Linz)
- K.334 (320b) Divertimento in D [No.17] (1779, Salzburg)
- K.335 (320a) Two marches in D (1779, Salzburg)
- K.336 (336d) Church sonata in C [No.17] (1780, Salzburg)
- K.337 Missa solemnis in C [No.15] (1780, Salzburg)
- K.338 Symphony in C [No.34] (1780, Salzburg)
- K.339 Vesperae solennes de confessore (1780, Salzburg)
- K.341 (368a) Kyrie in D minor (1788?, Vienna)
- K.343 (336c) Two German sacred songs for one voice with bass (1787?, Prague / Vienna)
- K.344 (336b) Zaide (Das Serail) [Singspiel] (1779-80, Salzburg)
- K.345 (336a) Thamos, König in Ägypten [Play with music] (1779, Salzburg)
- K.346 (439a) Notturno for 3 voices "Luci care, luci belle" (1783 ?, Vienna)
- K.347 (382f) Canon "Wo der perlende Wein im Glase blinkt." (1782, Vienna)
- K.348 (382g) Canon "V'amo di core teneramente." (1782, Vienna)
- K.349 (367a) Song (Die Zufriedenheit) for one voice "Was frag ich viel nach Geld und Gut" (1780-81, Munich)
- K.351 (367b) Song for soprano (or tenor) "Komm, liebe Zither." with mandolin (1780-81, Munich)
- K.352 (374c) Eight variations in F for piano on "Dieu d'amour" from the opera «Les Marriages Samnites» by Gretry (1781, Vienna)
- K.353 (300f) Twelve variations in E flat for piano on the French song "La belle Françoise" (1781/82 ?, Vienna)
- K.354 (299a) Twelve variations in E flat for piano on the Romance "Je suis Lindor" from the Comedy «Le Barbier de Seville» by Baudron (1778, Paris)
- K.355 (576b) Minuet for piano in D (fragment) (1789?, Vienna?)
- K.356 (617a) Adagio for glass harp in C (1791, Vienna)
- K.357 (497a) Sonata for piano by four hands, in G (fragment) (1786, Vienna)
- K.358 (186c) Sonata for piano by four hands, in B flat (1774, Salzburg)
- K.359 (374a) Twelve variations for piano and violin on "La Bergère Célimène" by Antoine Albanese (1781, Vienna)
- K.360 (374b) Six variations for piano and violin on "Au bord d'une fontaine" by Antoine Albanese (1781, Vienna)
- K.361 (370a) Serenade in B flat [No.10] «Gran Partita» (1781 ?, Vienna)
- K.363 Three minuets (without trio) (1780?, Salzburg)
- K.364 (320d) Sinfonia concertante for violin, viola in E flat (1779, Salzburg)
- K.365 (316a) Concerto for two pianos in F flat [No.10] (1779, Salzburg, Vienna)
- K.366 Idomeneo, Rè di Creta, ossia Ilia ed Idamante [Dramma per musica] (1780-81, Salzburg - Munich)
- K.368 Recitative "Ma che vi fece o stelle." and aria for soprano "Sperai vicino al lido." (1781, Munich)
- K.369 Scena (Recitative and aria) for soprano "Misera, dove son?" and "Ah, non son'io che parlo." (1781, Munich)
- K.370 (368b) Quartet in F for oboe, violin, viola and violoncello (1781, Vienna)
- K.371 Rondo for horn in E flat (fragment) (1781, Vienna)
- K.372 Allegro to a sonata for piano and violin, in B flat (1781, Vienna)
- K.373 Rondo for violin in C (1781, Vienna)
- K.374 Aria for soprano "Or che il cielo a me ti rende." (1781, Vienna)
- K.375 Serenade in E flat [No.11] (1781, Vienna)
- K.376 Sonata for piano and violin, in F [No.32] (1781, Vienna)
- K.377 (374e) Sonata for piano and violin, in F [No.33] (1781, Vienna)
- K.378 Sonata for piano and violin, in B flat [No.34] (1779, Salzburg)
- K.379 (373a) Sonata for piano and violin, in G [No.35] (1781, Vienna)
- K.380 (374f) Sonata for piano and violin, in E flat [No.36] (1781, Vienna)
- K.381 (123a) Sonata for piano by four hands, in D (1773/4, Salzburg)
- K.382 Concerto Rondo for piano in D (1782, Vienna)
- K.383 Aria for soprano "Nehmt meinen Dank, ihr holden Gonner!" (1782, Vienna)
- K.384 Die Entführung aus dem Serail (The Abduction from the Harem) [Singspiel] (1781-82, Vienna)
- K.385 Symphony in D (Haffner) [No.35] (1782, Vienna)
- K.386 Concerto Rondo for piano in A (1782, Vienna)
- K.387 Quartet in G [No.14] for 2 violins, viola, violoncello «Haydn-Quartett No.1 / Spring Quartet / Frühlingsquartett» (1782, Vienna)
- K.388 (384a) Serenade (Nacht Musique) in C minor [No.12] (1782, Vienna)
- K.389 (384A) Duet for 2 tenors "Welch angstliches Beben" (fragment) (1782, Vienna)
- K.390 (340c) Song for one voice "Ich wurd' auf meinen Pfad" or "An die Hoffnung" (1781-82, Vienna)
- K.391 (340b) Song for one voice "An die Einsamkeit" or "Sei du mein Trost" (1781-82, Vienna)
- K.392 (340a) Song for one voice "Verdankt sei es dem Glanz" (1781-82, Vienna)
- K.394 (383a) Prelude and fugue for piano in C (1782, Vienna)
- K.395 (284c) Prelude for piano in C (1777, Munich)
- K.396 (385f) Fantasia in C minor (1782, Vienna)
- K.397 (385g) Fantasia for piano in D minor (fragment) (1782, Vienna)
- K.398 (416e) Six variations in F on "Salve tu, Domine" from the opera «I filosofi immaginarii» by Paisiello (1783, Vienna)
- K.399 (385i) Suite for piano in C (fragment) (1782, Vienna)
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