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Lester Flatt and Earl Scruggs, known as Flatt and Scruggs, were a highly influential American bluegrass duo active in the mid-20th century. Together, they popularized bluegrass music throughout the United States and helped shape its distinctive sound. Flatt primarily played guitar and sang lead vocals, while Scruggs provided the distinctive three-finger banjo style that became a hallmark of bluegrass music.