I would use “Empty Spaces” by Pink Floyd. The album version, only the instrumentals from about :20 to 1:00. Bad assery* at its finest and who other than Pink Floyd would create something so awesome? 
*As long as you don’t imagine flowers having sex while listening to the song, it sounds very bad ass and evil.
That’s such a damn fine selection, I’m really surprised it isn’t more commonly used already.
Thank you.
I wonder the same thing and just assume the rights to use the song are too expensive.
Lynard Skynard’s The Breeze or Mr. Saturday Night Special
The first says, “I make this look easy” and the second says “I’m only good for killing”.
After I become heavyweight champion of the world, I’ll hire John Williams to compose my own entrance theme. Something with all the menace of Vader’s march and Jaws, but with a good bit of gladiator entrance trumpeting brass.
I Love the Dead by Alice Cooper.
White and Nerdy by Weird Al
Sonne by Rammstein was written for the Kalitscho brothers … but they decided they didn’t want it …
I personally love the song.
“Imagine,” by John Lennon
Just to lull the opponent into a false sense of security.
Or “Glory Days”
The Wreck of the Edmund Fitzgerald.
Jeff Monson came out to that when he fought for the heavyweight title. Unfortunately, he lost.
I’d probably come out to Fuck the Bullshit by 311. Or maybe Voodoo Child. I used to love how Hogan walked down to the ring dancing and miming that song.
Something from S&M-rock plus classical!
Sounds of Silence by Simon and Garfunkel, just for giggles
Keep Their Heads Ringin’ by Dr. Dre if you want a more urban feel
Dazed and Confused - Led Zep
pretty much my story, anywaySmack My Bitch Up - Prodigy
Wolf Like Me- TV on the Radio
I’ve had daydreams about this. I’ld time it so I hit the ring howling during the end.
“It Isn’t Easy Being Green” or “Barney” (theme from the TV show).
All I Need Is A Miracle - Mike and the Mechanics
Black Bonnet Girls by the Electric Amish
Maybe some John Philip Sousa - something to get pumped up to.
Stuff like The Thunderer, Stars and Stripes Forever, Entry Of The Gladiators, and the Washington Post March are all good but maybe too well known. And the Liberty Bell March is right out. Maybe Comrades of the Legion March, Bullets and Bayonets, the Directorate, or the West Point March.
Fighters - I don’t know, but I feel that since the other two men in the ring get played in let’s bring on the referee with “Theme from the Third Man”.
So you want to get laughed at before you get the shit beat out of you? To each his own, but getting knocked senseless is enough for me :).