A HUMMMM:
The Monroe Brothers were one of the most popular duet teams of the 1920s and into the 1930s. Charlie played the guitar, Bill played the mandolin and they sang duets in harmony. When the brothers split up as a team in 1938, both went on to form their own bands. Since Bill was a native of Kentucky, the Bluegrass State, he decided to call his band "Bill Monroe and the Blue Grass Boys," and this band sound birthed a new form of country music.