1) Celine Dion - You Shook Me All Night Long (Originally by AC/DC).
2) Sugababes/Girls Aloud - Walk This Way (Aerosmith/Run DMC).
3) Westlife - More Than Words (Extreme).
4) Will Young - Light My Fire (The Doors).
5) Mike Flowers Pops - Wonderwall (Oasis).
Though personally, I'd have added Ronan Keating's "Fairytale Of New York" to that list. Anyone who can change the line 'You cheap, lousy faggot' to 'you're cheap and you're haggard' because he 'wouldn't want to offend anyone' deserves it.