Jimi Hendrix - Star Spangled Banner "At Woodstock, Hendrix did far more than just perform the national anthem he turned it into a searing commentary about the Vietnam War, using his other-worldly talents on the guitar to mimic the sounds of planes, explosions and screams. More significantly, he struck a claim that the song belonged as much to his generation as it did to the old guard."
http://www.youtube.com/watch?v=Nab0Cs2i7JA
Also anything from RATM. Zack de la Rocha, the lead singer, even left the band because he wanted to pursue a more "political flavour" with his music. Just an example but well worth a listen. RATM - KILLING IN THE NAME OF. "As pure an adrenaline rush as anything ever produced in the hard rock/metal realm, Killing in the Name stands as the Godzilla of modern political anthems. Its message has been wrongly interpreted more often than not, as far too many fans took the songs signature chant, [content moderated] as a free pass to act without regard for others. Listeners with something more than just a simple mosh-pit mentality, however, realized that the song was an urgent wake-up call addressed to an overly content populace that blindly refused to question the state of world affairs."
