The Rock's entrance music is extremely iconic, and you have to give thanks to composer Jim Johnston (a dude who should be elected to not just the WWE Hall of Fame, but some other music HOFs, too) for that. The style of the music regardless of genre is associated with The Great One. Anytime you hear it, you think of him.

But if you have to tell me which is the best, it's when he played the Hollywood heel: Is Cookin'. Introduced at No Way Out and subsequently revised the following night in Toronto, it's a joy to listen.

http://www.youtube.com/watch?v=SzLrRpE6BtQ

What makes that rock song so fantastic is the ability to tell a story in every second. The slow intro with the helicopter in the background helps build something epic and frustrated. Like The Rock went to Hollywood and felt angry at the people for booing him. Finally, when the drums and cymbals clash, energy exerts itself, and it makes you feel pumped up albeit the slow, confident tune. The guitar riffs change the flavor and add even more depth into The Rock's quest for respect.