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==== Beat ====
The most basic unit of time for music. Tempo is often listed in terms of beats per minute, and time signatures are listed in terms of beats per measure. In 4/4 time, each measure has 4 beats and each quarter note has a duration of 1 beat. A metronome often is set to click once per beat.
==== Center Frequency ====
This is the frequency around which a band-pass, band-stop, or shelf EQ is centered. For a shelf, this is the point where the signal reaches half the desired attenuation.
==== Chord ====