turntablism, and actually... They have CD decks you can mix with, but even better; they have encoded vinyls. Stanton's Final Scratch. You select a track (on your computer in any "normal" media format), select a deck and then it plays on your normal turntable just like everything else.

Actually, since a CD is never "touched" by the player (like a casseste or vinyl); as long as you don't scratch it yourself, a CD will play forever. Everytime you play a vinyl, even if the needles are perfectly balanced; you still wear it down.