In music, what does "interval" refer to?

"Interval" in music refers specifically to the distance between two pitches. This measurement can be defined in various ways, including the number of half steps or whole steps between the two notes, as well as the relationship of those notes within a scale. Intervals are fundamental to creating melodies and harmonies, as they determine how notes relate to one another in terms of pitch.

Understanding intervals allows musicians to identify and construct chords, scales, and melodies effectively. For instance, a major third interval consists of four half steps, while a perfect fifth spans seven half steps—both of which are vital concepts in music theory and composition.

The other options address different aspects of music: the structure of a composition relates to the organizational framework of a piece; the duration of notes pertains to rhythm and timing; and volume refers to dynamics, reflecting the loudness or softness of sound. Each of these elements contributes to the overall musical experience, but they do not define the term "interval."