accompaniment (ac¦com|pani|ment)

noun

• 1a musical part which supports or partners an instrument, voice, or group: she sang to a guitar accompaniment [mass noun]: sonatas for piano with violin accompaniment
• a piece of music played as a complement or background to an activity: lush string accompaniments to romantic scenes in films we filed out to the accompaniment of the organ

• 2something that supplements or complements something else: these biscuits are a lovely accompaniment to tea