DJ (Disc Jockey): One who selects and plays pre-recorded music for an audience.

Turntablist (tern-tay-belest): One who uses the turntable as a musical instrument.

Turntablism:
The ART of manipulating sound and creating music using phonograph turntables and an audio mixer. Beat mixing, scratching, and beat juggling are some of the elements in a Tablist's arsenal. [More about Turntablism]