The pieces contained here represent the complete series of Colla"s original compositions with flute, and belong to two clearly distinct creative periods. The Duo for flute & guitar dates from 1808 and was one of the very earliest plates to be engraved by the Milanese publisher Ricordi. The Quartet for flute, violi, viola & guitar is a later work (1817-1822) and may be placed in Colla"s second stylistic period alongside the Fantasia for piano & flute, Op. 25, published around 1829.