Harmony refers back to the "vertical" sounds of pitches in music, which implies pitches that are performed or sung with each other at the same time to make a chord. Generally, This implies the notes are played at the same time, although harmony may additionally be implied by a melody https://uancv.edu.pe/ofinvestigacion/app/upload/users/4/455/my_files/apakah-penampilan-penting-dalam-industri-musik.html