accord, agreement - harmony of people's opinions or actions or characters; "the two parties were in agreement"

conjunction, co-occurrence, coincidence, concurrence - the temporal property of two things happening at the same time; "the interval determining the coincidence gate is adjustable"

sound - the particular auditory effect produced by a given cause; "the sound of rain on the roof"; "the beautiful sound of music"

music - an artistic form of auditory communication incorporating instrumental or vocal tones in a structured and continuous manner