accompaniment

noun

1. (countable, uncountable)A part, usually performed by instruments, that gives support or adds to the background in music, or adds for ornamentation; also, the harmony of a figured bass.

   “Brooks performed a saxophone solo on stage, with Robert as accompaniment on the bass.”

2. (countable, uncountable)That which accompanies; something that attends as a circumstance, or which is added to give greater completeness to the principal thing, or by way of ornament, or for the sake of symmetry.

   “A side salad is a common accompaniment to a main dish.”

   “forecasting torrential rain, with an accompaniment of crashing thunder.”

   “Green sauce is the perfect accompaniment to baked fish.”

   “My audience to this not-too-easy operation was a small group of Scottish school lasses, who seemed (perhaps naturally) to find the proceedings somewhat mysterious, but at any rate amusing. I wished they would go away, but they didn't, so I had to get on with the job to the accompaniment of a background of giggles!”