In "No. 44, The Mysterious Stranger" there's a scene where 44 appears in the
guise of a singer (I don't have access to my book at the moment, but I think
he may be a minstrel singer, specifically) strumming a banjo, and strongly
affects the narrator with a rendition of "Buffalo gal, won't you come out
tonight" or something similar. This might be the kind of thing you're
looking for.

Bob G.