What is the definition of a triplet in music?

A triplet in music is defined as a group of three notes played within the duration typically allocated to two notes of the same value. This rhythmic grouping allows musicians to create a particular feel or swing to a piece of music. For instance, in a context where only two notes would normally fit within a given beat, a triplet adds a third note, effectively subdividing the beat into three equal parts. This concept is fundamental in various musical styles and helps in achieving intricate rhythms and textures within a composition.

The other options describe different musical concepts. A musical interval spanned by three whole tones does not accurately convey the idea of a triplet, which is more about rhythmic grouping than tonal distance. A sequence of three notes forming a chord refers to harmony rather than rhythm. Lastly, while triplets can indeed be played in fast tempos, the definition itself focuses specifically on the structure and timing of the notes rather than their speed. Thus, the choice that defines a triplet accurately is the most appropriate response.