Harmony refers to the "vertical" Appears of pitches in music, which implies pitches that are played or sung together concurrently to create a chord. Ordinarily, What this means is the notes are performed concurrently, While harmony could also be implied by a melody that outlines a harmonic composition (i.e., by http://icrodarisoveria.edu.it/chamilo/app/upload/users/2/2507/my_files/difference-between-mp3-and-wav-audio-files.html