Manley Augustus Buchanan (born April 19, 1949, Trenchtown, Kingston, Jamaica), better known as Big Youth (sometimes called Jah Youth), is a Jamaican DJ, mostly known for his work during the 1970s. Influenced by U-Roy, he started singing with Lord Tippertone's sound system in 1970. His first LP Chi Chi Run was produced by Prince Buster in 1971. The name of the band Sonic Youth is in part a tribute to Big Youth.

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