Oh bluddy hell........I've just got to post this (actually *borrowed from PB)
('tis about DJing)
The biggest, most important layer at the bottom is what tunes you play The next layer up of a bit less importance is what order they come in. The third layer is the manner in which they are blended into one another. The tip is mix trickery, scratching, eq-ing, FX yadda yadda Each layer relies upon that beneath itself or it's rendered pointless.