Turandot Puccini. He left behind 36 pages of sketches on 23 sheets for the end of "Turandot". Some sketches were in the form of "piano-vocal" or "short score," including vocal lines with "two to four staves of accompaniment with occasional notes on orchestration." These sketches supplied music for some, but not all, of the final portion of the libretto. Puccini left instructions that Riccardo Zandonai should finish the opera. Puccini's son Tonio objected, and eventually Franco Alfano was chosen to flesh out the sketches after Vincenzo Tommasini (who had completed Boito's "Nerone" after the composer's death) and Pietro Mascagni were rejected.
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: