A time signature is a musical notation that indicates the number of beats in a measure and what note value constitutes one beat. It typically appears at the beginning of a piece of music and is expressed as a fraction, where the top number represents how many beats are in each measure, and the bottom number indicates which note value gets the beat. In the context of rock and roll, time signatures play a crucial role in shaping the rhythmic feel and structure of songs, contributing to the genre's distinctive sound and cultural impact.
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