Trio for Piano, Flute and Cello in G minor, Op. 63, J. 259 was composed by Carl Maria von Weber in 1818–1819 and published the next year. It is one of his most substantial chamber pieces. The composition process can be traced from entries in Weber’s diary: on 8 April 1818 he “worked on trio”; on 12 May he probably began composing the finale rondo (in Dresden). He then fell ill and resumed work on two first movements only in July 1819. The whole trio was finished on 25 July 1819 in Hosterwitz, the composer’s summer residence. Surprisingly no traces of the third movement can be found in the diary. These is an assumption that it was derived from Adagio with Variations for cello and piano, J.Anh.42 (composed in 1813 in Prague), a work today lost. It is believed that the composer revised it for piano, flute and cello (or viola) in 1815 (J.Anh.58). This was composed for Weber’s friend Dr. Philipp Jungh, a fine flautist: they met in Prague in 1813. He also became the dedicatee of the Trio. Another Prague friend of Weber was Johann Baptist Gänsbacher, a composer, violinist and cellist. The Trio was probably written as a souvenir of convivial musical evenings held by the three.