accompaniment
ac-com-pa-ni-ment
noun
A musical part providing background support to a main melody.
"The piano offered a beautiful accompaniment to her singing."
noun
Something added to complement or enhance a main item.
"Crisps are a common accompaniment to sandwiches."
Thesaurus
Synonyms: backup, support, musical accompaniment, complement, concomitant, co-occurrence, attendant, escort