Mine is the worst possible:
Physical - Olivia Newton-John
UghhhhhHHhhhhHH!H!HH!H!H!H!H!H!H!H


But my life theme song is pretty accurate:
Masses Against the Classes - Manic Street Preachers (UK Chart)
The USA one was something by Savage Garden which is potentially meaningful because they are my future wife's secret guilty musical pleasure. (Don't tell anyone I told

)