Classical music provides some significant examples of great musical compositions that were never finished by their creators. A perennial favorite with many, Wolfgang Amadeus Mozart, never completed his magnificent Requiem Mass. Franz Schubert, who like Mozart, lived only a short life but produced over 600 works of music, wrote only two movements of his Eighth Symphony. Orchestras today still play this great composition, known appropriately as the Unfinished Symphony. Living in the latter nineteenth and early twentieth century, the Italian opera composer Giacomo Puccini also left a master creation unfinished, but thanks to his students, Puccini's last and greatest composition, Turandot, is performed many times each year throughout the world, because his disciples completed their master's wo…