Well, i dont know exactly, but it really depends on the crowd....this is what a good DJ did for New Years
It was all HipHop, Reggae
He started with ol skool dance songs (i forgot them)
so people could talk and just warm up after they arrive
Then he played a couple more opener songs (Kelis 'Mlkshake' , Sean Paul 'Get Busy; - songs that are hits, but not CRUNK ect) this got people into the mood, and once everyone was on top of their feet, he played CRUNk songs like "Get Low Remix" by Lil Jon f/ Ying Yang, Elephant Man and also "Hot in Herre"
ect