Music. Sound Bomb. Beatmixing is a disk jockey technique of mixing two tracks so that the beats of one occur at the same time as the other.
Beatmixing was invented in the late 1960s by Francis Grasso, who tried to keep people from leaving the dance floor between the songs. Initially he was looking for records with the same tempo, counting the tempo with a metronome. When the tempos didn't match, he was adjusting the pitch control on the turntable to bring the beats in sync. Rosie, a mixer built for him by Alex Rosner, let him listen to any channel in the headphones independently of what was playing on the speakers, allowing him to beatmatch the records by ear; this became the defining feature of DJ mixers. These days beatmatching and beatmixing are considered basic techniques among DJs in electronic dance music genres, and it's standard practice in clubs to keep the constant beat through the night, even if DJs change in the middle.
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