The document discusses musical time signatures. A time signature is a fraction written at the beginning of a musical composition that indicates the number of beats in each measure and which note value constitutes one beat. The top number indicates the number of beats per measure, while the bottom number indicates the note value. Common time signatures include 2/4 for duple meter with two beats per measure, 3/4 for triple meter with three beats, and 4/4 for quadruple meter with four beats. Each time signature dictates which beat in the measure receives emphasis.