Tori Amos :: Strange Little Girl (The Stranglers)
Inkubus Sukkubus :: I Just Can't Get You Out of my Head (Kylie Minogue)
Harry :: Imagination as mentioned above

hehe Rolf Harris :: Stairway To Heaven

If I had music related tv channels I'm sure i'd be able to name some abysmal covers beyond Atomic Kitten who seem to enjoy raping good 80's songs.