Muddy Waters "Mannish Boy" big signal on a W.PA. Kiwi w/ what the owner calls "a very big loop."
That song was one of the first diss tracks, except for a few words, it's exactly the same as Bo Diddley's "I'm A Man" recorded the year before. It's Water's telling the 22 year old Bo to sit down and shut up. A lot of Hoodoo references and sexual innuendo in both songs.
I'll go with "water" for the theme of tonight's show.