In music, a pasticcio or pastiche is an opera or other musical work composed of works by different composers who may or may not have been working together, or an adaptation or localization of an existing work that is loose, unauthorized, or inauthentic.
The term is first attested in the 16th century referring both to a kind of pie containing meat and pasta (see "pastitsio) and to a literary mixture; for music, the earliest attestation is 1795 in Italian and 1742 in English. It derives from the post-classical "Latin pasticium (13th century), a pie or pasty.
In the 18th century, "opera pasticcios were frequently made by composers such as "Handel, for example "Muzio Scevola (1721) and "Giove in Argo (1739), as well as "Gluck, and "Johann Christian Bach. These composite works would consist mainly of portions of other composers' work, although they could also include original composition. The portions borrowed from other composers would be more or less freely adapted, especially in the case of "arias in pasticcio operas by substituting a new text for the original one. In late 18th-century English pasticcios, for instance by "Samuel Arnold or "William Shield, the "borrowed" music could be Irish or British folksongs.
Instrumental works would also sometimes be assembled from pre-existing compositions, a notable instance of this being the first four "piano "concertos of "Wolfgang Amadeus Mozart. These concertos ("K. 37, 39–41) were assembled almost entirely from keyboard "sonata movements by contemporary composers, to which the boy Mozart added "orchestral parts supporting the keyboard soloist.
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