David Lang (born 8 January 1957 in Los Angeles, California) is a Pulitzer Prize-winning American composer. Together with Julia Wolfe and Michael Gordon, Lang co-founded Bang on a Can in 1987. His first recognition came from the BMI Foundation's Student Composer Awards in 1980 and 1981. He was a major contributor to the string quartet music, performed by Kronos Quartet, in the film Requiem for a Dream (2000).

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