Muscle Museum is the second extended play (EP) by English alternative rock band Muse. Limited to 999 hand-numbered copies, was released on 11 January 1999 by Dangerous Records. Four of the EP's five original songs – "Muscle Museum", "Sober", "Uno" and "Unintended" – were re-recorded for the band's full-length debut, Showbiz. The song Instant Messenger was rereleased as a B Side to Muscle Museum under the title Pink Ego Box. This version omits the AOL sample but is otherwise the same recording. Upon Muscle Museum's release, the title track entered the NME Indie Single Charts at #3, losing out on the top spot only to Mercury Rev and Fatboy Slim.