Trivia: John "Juke" Logan did the harmonica parts for the soundtrack. He also is the same person who did the harmonica on Home Improvement when the "boys from K&B Construction" did their musical "Ratchet Rhapsody" on Tool Time. If you listen closely, even Rock says "Ol' Juke whipped out his..."
Trivia: Willie told Eugene "Muddy Waters invented electricity." Muddy Waters was McKinley Morganfield's [4/04/1913 - 4/30/1983] stage name. Muddy Waters was from Mississippi but relocated to Chicago where he played/fathered "Chicago Blues" and was among the first to use an electric (trified) guitar. Due to how noisy the Chicago South Side was, Muddy need to "amp" the sound of his guitar. Like Willie told Eugene he needed a slide to play the Blues, Muddy Waters wore a slide. (00:34:40)