The shortest music track in my library: Introduction to Rhapsody on a Theme of Paganini, op. 43, by Rachmaninoff: 7 seconds.

And the longest: Amarok by Mike Oldfield: 1 hour. (Note that a section of Amarok is called Rachmaninoff.)

While you can download Amarok for 99 cents, Rachmaninoff might look more popular on last.fm… These 2 guys don’t take the time into account…