What is a 'triplet' in music?

A triplet in music is defined as a group of three notes that are played in the time typically allotted for two notes of the same value. This concept allows musicians to divide the beat into three equal parts, which is different from the usual division of beats found in common time signatures.

In the context of the correct choice, a triplet occurs when three notes are written with a small '3' above or below them, indicating that they should fit into the space of two notes that would normally occupy that same duration. For example, if you have a quarter note becomes three eighth notes when played as a triplet, the rhythm feels faster and creates a unique phrasing within the music.

This definition aligns perfectly with the correct choice, as it captures the essence of how triplets function rhythmically within a measure. Understanding triplets is essential for interpreting and performing music accurately, especially in genres where syncopation and complex rhythms are prevalent.