Classical music written in collaboration would include: There are also instances where a work was left unfinished at the composer's death, and was completed by another composer. In such cases, the later composer generally strives to ensure the finished product is as close as possible to the original composer's intentions, as revealed by their notes, rough drafts, or other evidence. One of the best known examples is the completion by Franco Alfano of Giacomo Puccini's opera "Turandot". There may also be a case for describing Sir Edward Elgar's Symphony No. 3 as a work by both Elgar and Anthony Payne. However, these types of works
Unfinished creative work missing music had to be provided by Franco Alfano for the premiere in 1926. Recently, Luciano Berio composed an alternative ending. Alban Berg had only finished the first two acts of his opera "Lulu" at the time of his death in 1935. Due to objections from his widow it was not until 1979 that a full version was performed, with music for the final act devised by Friedrich Cerha using Berg's sketches. Other musical works which are unfinished but performable, are simply given in their incomplete state. Schubert's symphony is the most famous, but Anton Bruckner's Ninth Symphony is performed