If you want a party to go successfully then scratching, mixing, blending are all cool but song selection is key. It sets the mood for the whole party or event. Thats why dudes get in fights at the club just as the latest lil john song is being blasted over the speakers. And a party can go from great to extremely awkward if you start playing "amazing grace" by the Brooklyn tabernacle choir right after you finish playing "ms. new booty" by bubba sparx.
This was a valuable lesson I learned while "DJ'ing" (or should I say making full use of the 'shuffle' feature on iTunes) for a 6 hour bbq. Song selection (and strategically placed business cards) is key.
DJ Tip for the Day: When in doubt always go back to the classics.........