Excellent beginning!
I love the atmosphere you set at the start! You really feel like you're in the middle of some crazy crowd shouting like crazy and having fun.
After 1:00 though, you start decomposing it and I feel this is where the the song starts to get bad =/ You had this great feeling and this great momentum. Then you stop short and it's like urk- what? The crowd clip doesn't really sound good stopped short like that either. It sounds un-natural.
I think one big problem was that it was sprung randomly in the middle. If you had something like one of the DJ's clips to separate it, then it would have been a more tolerable transition.
You've hit something potentially epic here though. You can do even better crowd manipulation songs if you keep at it, i'm sure =)