How about a choir featuring several microwave ovens? This video starts with a whirring microwave . . . and then a guy who hums along in harmony. Then it adds more microwaves, more humming, and a woman with a beautiful singing voice.
(It was posted December 1st on the Twitter page of@TheoShantonas. There are several edits. It gets really good starting at 1:01. The woman joins in at 1:26.)