http://www.youtube.com/watch?v=L028J4-n6qk
Audioslave - Shadow on the Sun
http://www.youtube.com/watch?v=LuhbawERy14
So many good ones. I like the qualifier of "put on repeat" as that really narrows down the list.
http://www.youtube.com/watch?v=0jgrCKhxE1s
Audioslave - Wide awake
http://www.youtube.com/watch?v=CrlWovBvPCM
http://www.youtube.com/watch?v=5BTzNX5OMN4
This song was super hard to learn to play, but now since i can play, I play it every time i pick up my guitar.
Corrosion of conformity - Clean my wounds
http://www.youtube.com/watch?v=yvsQsao1F88