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Throughout O Brother, Where Art Thou?, music plays a key role: Escaped convicts Ulysses Everett McGill (George Clooney), Pete (John Turtorro) and Delmar O'Donnell (Tim Blake Nelson), along with blues musician Tommy Johnson (Chris Thomas King), record a song called "Man of Constant Sorrow" that becomes a hit.

Played by real-life blues musician Chris Thomas King, Tommy Johnson plays guitar on The Soggy Bottom Boys' runaway hit and is later rescued by the other three from the KKK. Earlier in the film he tells them of how he sold his soul to the devil at a crossroads in exchange for his guitar-playing ability.