"J.A.R." by American rock-band Green Day.
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2nd contribution: If you/someone wants to know about the song during the OPENING credits, it is "Am I wrong" by Love spit Love. (Lead singer is from the Psychedelic Furs). This song is on a Love spit Love album, and is also on the 'Angus' soundtrack. The version on the soundtrack has the marching band blended in with it (pretty much how it is during the credits). -Echdrum