No clue. :]
OK, since Liam hasn't hurried up and replied, it's a Prince cover.
Really weird and good too. I'm listening to it now. First couple of verses of The Cross lead into the instrumental Hole, which then leads into the very trippy and weird early version of Yellow Hedgerow Dreamscape, in which some guy (not SW) introduces the "members" of Porcupine Tree, including Sir Tarquin Underspoon, The Evaporating Flan, and and Mr Jelly.