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In 1955, Lejaren Hiller, working with Leonard Isaacson at the University of Illinois at Urbana-Champaign, began a series of experiments in computer-automated musical composition. In 1957, they finished the 'Illiac Suite' for string quartet, the first substantial musical composition created with a computer.

Hiller commented: "I observed that if we could program a computer to simulate a 'walk' through, say, ordinary space, we could also simulate a 'walk' through a grid defined to represent musical elements such as pitch, rhythmic durations, and timbre choices ..."

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The photo at the left shows Lejaren Hiller at the control console of the Experimental Music Studio in the 1960s.

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