What are your favourite cover songs?

[ame="http://www.youtube.com/watch?v=qd0rNDkogaI"]Hair of the Dog by Guns N Roses - YouTube[/ame]


[ame="http://www.youtube.com/watch?v=Bz61YQWZuYU"]Great White - Once Bitten Twice Shy - YouTube[/ame]


oh yeah, and...

https://www.youtube.com/watch?v=F0N9ZyvYi5E



and how could I forget...
https://www.youtube.com/watch?v=FWQRDI7mTyw


...not sure why the last two didn't embed properly...