Notes, Notings, and Common Refrains

I tested the search terms I thought might be useful, and apparently "walla walla" is the technical term for background mutterings in theatre/radio/film.

For what it's worth, most of the non-food references when I didn't use something like "walla walla" or "foley" referred to peas and carrots as slang for things or people that work well together. "They go together like peas and carrots."