8. Avril Lavigne - "Imagine"
There's no doubting the fact that Avril Lavigne had only good intentions when she covered John Lennon's "Imagine" in 2007 for a tribute album that aided Darfur. She can't be faulted for that. But her version sounds like it came from a karaoke night somewhere in Ontario, and the video looks like a 1990s commercial for blue jeans. The whole thing really, really doesn't work.