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.
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