XM (album)
 XM (also Transmission 1.1 and Transmission 1.2) is a live-in-studio album recorded by British band Porcupine Tree in early 2003 as a live album of mostly In Absentia tracks. This was taken from a session at XM Satellite Radio in Washington DC on 12 November 2002 and was originally released as a limited edition tour album. It was later released online on the Porcupine Tree store.