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Bill Monroe started playing professionally in the 1930s with as a brother duet with Charlie Monroe. After they split up, he formed a band and eventually called it The Blue Grass Boys because they were from Kentucky, the bluegrass state. When Earl Scruggs brought his distinctive banjo sound into the band, the sound that would evenually be known as bluegrass was created.
When Flatt & Scruugs left Monroe's band and started their own group, in effect the second significant bluegrass band, Monroe did his best to sabotage their careers until he realized that they were part of a new genre of music that he had, in effect, created.