What is the difference between background sound and accompaniment?

Background music can express emotion better. Accompaniment is a concept formed after the rise of melody music. Background music refers to the soundtrack used to adjust the atmosphere in TV series, cartoons and programs, which can express emotions more clearly. Accompaniment is a concept formed after the rise of theme music, aiming at improving the artistic expression of the main theme (including many aspects) and forming subordinate music fragments. Red flowers need green leaves to match; Chords refer to the distance relationship between three or more notes, while column chords, in addition to staccato chords, also have bells.