Beatmatching is a mixing technique employed by DJs. While
originally it involved counting the tempo with a metronome and
finding a record with the same tempo, today it involves changing
the speed at which a recording is played back so that its tempo
matches that of the song currently playing. In this way, the DJ
can either simultaneously play two songs of different original
tempos without their beats clashing or "galloping" or can more
smoothly transition between two songs. The tempo of the
recording can be changed through the use of specialized playback
mechanisms. In the case of vinyl records, for example, the
turntable would have a separate control for determining the
relative speed (typically listed in percent increments) faster
or slower the record can be played back. Similar specialized
playback devices exist for most recorded media. Changing the
speed the record is playing is called pitching or pitch
shifting. For a DJ wishing to beatmatch using vinyl turntables,
the general procedure involved is relat