A song that I've used for years to get me psyched up for performances or times where I feel stressed is The Cure's "The Exploding Boy." I know it mostly as one of the B-Sides featured on side 2 of the Standing on a Beach cassette. Stretching and fatigue to the cassette can mostly be blamed on repeated rewinds and playing of this song.
http://www.youtube.com/watch?v=dDWj8smIw84
( Lyrics )
http://www.youtube.com/watch?v=dDWj8smIw84
( Lyrics )