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
Giacomo Puccini selective, and at times indecisive, in his choice of subject matter for new works. Puccini was deeply involved in the process of writing the libretto itself, requiring many iterative revisions of his libretti in terms of both structure and text. Puccini's relationships with his librettists were at times very difficult. His publisher, Casa Ricordi, was frequently required to mediate disputes and impasses between them. Puccini explored many possible subjects that he ultimately rejected only after a significant amount of effort—such as the creation of a libretto—had been put into them. Among the subjects that Puccini seriously considered, but abandoned, were: