The hidden final track on R.E.M.'s 1988 major-label debut, 'Green,' sure goes by a lot of different names. Unlisted on the back sleeve, the song is copyrighted under the title '11,' but it goes by simply 'Untitled' in the iTunes Store and is often referred to by fans as 'The Eleventh Untitled Song.' "At the time it was really cool to have unlisted, 'hidden' tracks for the fans, and that was ours," singer Michael Stipe once told the Pop Songs fansite. "It's untitled because we just pretended like it didn't exist."