Inspiration comes to composers in many forms. A musician was recording certain bodily functions for his homesick brother, when happenstance delivered a sublime moment of melody. He ran with it (SLYT).
Wagner's "Ride of the Valkyries" arranged for 8 pianos - performed by Leif Ove Andsnes, Emanuel Ax, Claude Frank, Evgeny Kissin, Lang Lang, James Levine, Mikhail Pletnev, and Staffan Scheja. [more inside]
All the Great Operas in 10 minutes (1992) is a very quick overview of La Traviata, Carmen, Don Giovanni, Aida, Tosca, Tristan and Isolde, Madame Butterfly, Ring of the Nibelung (a four-parter), resulting 26 dead, plus all the gods of Valhalla, which brings the grand total to 38 dead. 10 More Operas in 10 Minutes is a tribute to the original, created by the students of the Tulsa School of Arts and Sciences, covering The Merry Widow (technically an operetta), The Force of Destiny, Lucia di Lammermoore, The Magic Flute, Falstaff, The Damnation of Faust, Rigoletto, Romeo and Juliet, La Bohème, and William Tell. Only 14 deaths tallied (not counting armies fighting).