Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. 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. Porcupine Tree are a progressive rock band formed by Steven Wilson in 1987 in Hemel Hempstead, Hertfordshire, England. Their music is difficult to categorize, being associated with both psychedelic rock and progressive rock, yet having been influenced by trance, krautrock and ambient due to Steven Wilson and Richard Barbieri''s liking for the Kosmische Musik scene of the early ''70s, led by bands such as Tangerine Dream, Neu! and Can. Since the early 2000s, their music has been leaning towards progressive metal.
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