I'll refrain from posting some Pantera because Legion already did. I'll also limit myself to one vid per band, because I'm sure no one wants to see me post 20 Flogging Molly vids.

Flogging Molly - What's Left of the Flag:
[yt=425,350]http://www.youtube.com/watch?v=l6Ammrgxsi0[/yt]

Sepultura - Attitude:
[yt=425,350]http://www.youtube.com/watch?v=8LgC7q5sWdM[/yt]

Social Distortion - I Was Wrong:
[yt=425,350]http://www.youtube.com/watch?v=vyCERZBxv5Y[/yt]

Nirvana - Where Did You Sleep Last Night. They didn't write it, but what a fucking awsome performance.
[yt=425,350]http://www.youtube.com/watch?v=NEtDC6MuImU[/yt]

Mark Lanegan - House a Home. This song makes me think of my mom, may she rest in peace.
[yt=425,350]http://www.youtube.com/watch?v=DvwEkZFfmPk[/yt]