Something I have been looking for starting a long time ago is a way to find cover songs or find out if someone has covered a song that I like, especially Redemption Song. So after years of looking for a way to do this, which normally ended up being a google search, I found the best website ever,
Second Hand Songs. Type in the name of the song you want to see and it will tell you every band that has covered it. Type in an artist and it will tell you if anyone has covered their songs or if they have covered any songs. It is amazing.