Almost every one has there own theme song, (you know if its your theme song or someone elses when thay yell out... "Oh YA, THIS IS MY JAM!". And for the who have not yet found their soul music will know it when they hear it. My theme song is Vengaboys - We Like To Party (Six Flags 2004 Theme Song)
I have lots of songs I really love as a music collector, but I guess that I always go nuts, yelling "Oh Yeah!" whenever they play JUMP! by Van Halen! =)
BUT... if I were to have a tune they had to play whenever (never) I would enter a boxing ring, it would probably be Waidmanns Heil by Rammstein! That song has an epic horn to introduce the mayhem! Heheh...
Composed for Narnia. Yes, people still compose music like that. Famous among them is Hans Zimmer, composer of the Pirates of the Caribbean 2, 3 and 4 tracks.