"Two turntables and a microphone" is the basic concept of a DJ's equipment. This phrase describes turntables (phonographs) and a microphone connected to a mixer. The DJ uses the mixer's crossfader to fade between two songs playing on the turntables. Fading often includes beatmatching. Live hip hop music also often has an MC rapping into the microphone. In nightclubs the microphone is usually used only for announcements.