From about 2:01 and on. Someone put this video up in the best crowd response thread I believe & I watched it like

they're actually SINGING the entire song. That had to be live as hell. Imagine if that happened nowadays in the 'E....Punk comes out for PPV in the Chi and everyone sings "Cult Of Personality" while he walks to the ring or after the match.
ECW entrance themes kind of had an unfair advantage though by being real songs. From New Jack's "Natural Born Killaz" playing throughout the entire match and you just KNOWING it was about to go down when it hit...or people chanting w/ Pantera's "Walk" when RVD came out or even the foam head party for Al Snow coming out to "Breathe"....
WCW honorable mention for MY childhood: NWO Wolfpack
WWF/E: The Rock, DX (loved that shyt), or Austin. More so, Austin b/c he could clean house and celebrate w/ his music playing the whole time.
Theme music's a big deal to me. One of the reasons that Jack Swagger irks me. I'm a RATM fan and his music's done by a RATM "tribute" band so even though the song's kind of dope, it's always going to irk me.