This document discusses the evolution of DJing and music production over the last decade. It covers how DJing used to solely focus on turntablism, but now many producers start as music producers and later become DJs. It emphasizes the importance of beatmatching to mix songs together at the same tempo and in sync. Beatmatching can be done manually by ear by adjusting the pitch fader, or automatically through sync functions on modern equipment. The document also touches on the controversy around sync functions and whether they take away the art of DJing.