accompaniment, concomitant, attendant, co-occurrence -- (an event or situation that happens at the same time as or in connection with another)
accompaniment, musical accompaniment, backup, support -- (a musical part (vocal or instrumental) that supports or provides background for other musical parts)
complement, accompaniment -- (something added to complete or embellish or make perfect; "a fine wine is a perfect complement to the dinner"; "wild rice was served as an accompaniment to the main dish")
escort, accompaniment -- (the act of accompanying someone or something in order to protect them)
(Sound)
