Harmony refers back to the "vertical" sounds of pitches in music, which suggests pitches which have been played or sung collectively concurrently to make a chord. Usually, This implies the notes are performed concurrently, Even though harmony may also be implied by a melody that outlines a harmonic composition (i.e., https://my.bankstreet.edu/ICS/icsfs/the-most-popular-types-of-audio-formats-today.html?target=47876a17-5f4e-443d-8182-66e8ecbf03c3