Harmony refers to the "vertical" sounds of pitches in music, which implies pitches which can be performed or sung alongside one another simultaneously to produce a chord. Commonly, This implies the notes are performed concurrently, Whilst harmony can also be implied by a melody that outlines a harmonic framework (i.e., https://emmaklewis.sites.gettysburg.edu/scalar/saliman//youtube-channels-for-the-best-childrens-song.html