In 1941, on his front porch, Muddy Waters recorded a song for the folklorist Alan Lomax. After singing the song, which he told Lomax was entitled "Country Blues," Waters described how he came to write it. "I made it on about the eighth of October '38," Waters said. "I was fixin' a puncture on a car. I had been mistreated by a girl. I just felt blue, and the song fell into my mind and it come to me just like that and I started singing." Then Lomax, who knew of the Robert Johnson recording called "Walkin' Blues," asked Waters if there were any other songs that used the same tune. "There's been some blues played like that," Waters replied. "This song comes from the cotton field and a boy once put a record out — Robert Johnson. He put it out as named 'Walkin' Blues.' I heard the tune before I heard it on the record. I learned it from Son House." In nearly one breath, Waters offers five accounts: his own active authorship: he "made it" on a specific date. Then the "passive" explanation: "it come to me just like that." After Lomax raises the question of influence, Waters, without shame, misgivings, or trepidation, says that he heard a version by Johnson, but that his mentor, Son House, taught it to him. In the middle of that complex genealogy, Waters declares that "this song comes from the cotton field."

Blues and jazz musicians have long been enabled by a kind of "open source" culture, in which pre-existing melodic fragments and larger musical frameworks are freely reworked. Technology has only multiplied the possibilities; musicians have gained the power to duplicate sounds literally rather than simply approximate them through allusion. In Seventies Jamaica, King Tubby and Lee "Scratch" Perry deconstructed recorded music, using astonishingly primitive pre-digital hardware, creating what they called "versions." The recombinant nature of their means of production quickly spread to DJs in New York and London. Today an endless, gloriously impure, and fundamentally social process generates countless hours of music.

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