Music is often grouped into repeating patterns of the beat. Those repeating patterns are called meter.
The most common meters are duple meter, which has groups of two beats; triple meter, which has groups of three beats; and quadruple meter, which has groups of four beats.
The music in each example below is very simple and very similar, but each one is in a different meter. Count the beats while listening to each example. For the duple meter example, count “one - two.” For the triple meter example, count “one - two - three.” For the quadruple meter example, count “one - two - three - four.” RhythmBot will count along with you.