Cover your bases (musically)

So I have an idea that I think would be really interesting.  I like music.  I like to listen to music.  I like hearing new songs and discovering new artists.  I also have a weird desire to hear the same song done in different ways by different people- covers.

I stumbled across SecondHandSongs.com and found that there is a database of cover songs (it only lists covers that were recorded and put out by a record label, no do-it-yourself or amateur covers allowed).  Fascinating.

Now I come to the idea part.  I think it would be cool to have a plugin for your favorite music player (Banshee, iTunes, WInamp, etc) that looks up the song from your play list and lists covers of that song, with other info perhaps or links to find more info.  It would be really cool to see a list of others that did that song and be able to click on them to hear a sample of their version, or a link to a music service (or store) to buy/download the other version(s).  And perhaps a way to rate them too?  Not sure about that one.

Finally a way to build my own collection of nothing but covers of the song "Moon River"! (this is a joke, I actually hate that song).