Thelonious Sphere Monk was an American jazz pianist and composer. He had a unique improvisational style and made numerous contributions to the standard jazz repertoire, including "'Round Midnight", "Blue Monk", "Straight, No Chaser", "Ruby, My Dear", "In Walked Bud", and "Well, You Needn't". As of 2009, Monk was the second-most-recorded jazz composer in history, after Duke Ellington.
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