R&P: Are there any good youtube covers of your favourite songs?

I saw a pretty good Mama Cass cover. And while trying to find that link came across a href="http://www.youtube.com/watch?v=NOgeTTWW9m4" rel="nofollow"http://www.youtube.com/watch?v=NOgeTTWW9…/a by the same person. "Cry Baby Cry" by The Beatles. Consequently, I saw a lot MORE covers of that song and other Beatles songs, many pretty good. I can say I like SOME covers...others, I think the person shouldn't do a cover. I saw a HORRENDOUS cover of a Led Zeppelin song by Justin Bieber. I forget which song it was now, but it proves that even the BEST song can be screwed up by SOMEONE.