harmony
n. C / Un. a state where people or things live together peacefully. In music, it is the pleasant sound of different notes played at the same time.
n. a state of agreement or concord between people, ideas, or objects. In a musical context, the simultaneous combination of notes to produce chords and chord progressions with a pleasing effect.
The singers perform in perfect harmony.
The community worked hard to ensure that different ethnic groups lived together in harmony and mutual respect.
While the melody remains simple, the complex vocal harmony adds a layer of emotional depth that defines the entire composition.
Uncountable when referring to the abstract state of peace or agreement; countable when referring to specific musical arrangements or combinations of notes.