Bo Didley was a human musician. In 1954, he recorded the song "Mona" in a studio in Chicago. In 2007, Ace heard a United Nations armed forces radio station broadcast this recording, reminding her of the time she first had heard it years before. (PROSE: Cat's Cradle: Warhead)
Behind the scenes
In the real world, the musician's last name is spelled "Diddley" instead of "Didley", as it's spelled in the novel.