accompaniment

(noun) an event or situation that happens at the same time as or in connection with another. Synonyms: concomitant, attendant, co-occurrence.

(noun) a musical part (vocal or instrumental) that supports or provides background for other musical parts. Synonyms: musical accompaniment, backup, support.

(noun) something added to complete or embellish or make perfect. Synonyms: complement. Examples: "A fine wine is a perfect complement to the dinner." "Wild rice was served as an accompaniment to the main dish."

(noun) the act of accompanying someone or something in order to protect them. Synonyms: escort.