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In music and music theory, the beat is the basic unit of time, the pulse of the mensural level (or beat level). In popular use, the beat can refer to a variety of related concepts including: tempo, meter, rhythm and groove. In modern pop music, the term "beats" has been used to describe whole pieces of composed music. This is a distinct and separate use of the term from the way "beat" is used traditionally as related only to the rhythmic element of music.