There's an old joke that Schubert wrote two symphonies: one unfinished, and the other endless—the reference being to Schubert's "Unfinished Symphony" which lasts about 20 minutes, and his "Great" Symphony in C Major, which can run about an hour in performance.

It was Antonio Salieri, one of Schubert's composition teachers in Vienna, who encouraged the young composer to date his manuscripts, so we know that Schubert's "Unfinished" Symphony was written in 1822. It wasn't performed in public, however, until December 17th, 1865—some 43 years later. The manuscript was known to exist, but no one bothered much about it until Josef von Herbeck tracked it down and conducted its first performance in Vienna.

At its premiere, Herbeck added the last movement of Schubert's Third Symphony in D as a kind of makeshift finale. Many others have tried to "finish" the "Unfinished" Symphony, but more often than not, it is performed as an incomplete, yet oddly satisfying, work.

The Icelandic composer Jon Leifs, who died in 1968, apparently worried that he might leave some unfinished orchestral score behind. Therefore, he composed not one but TWO works he titled "Finale." These were intended as a kind of "musical insurance policy." To each score, Leifs attached a note suggesting that if he died and left behind any unfinished orchestral projects, either of these two "Finales" could be used.