In 1940s bill monroe added two musicians to his band to complete the classic blue grass lineup?

In the 1940s, Bill Monroe added the iconic musicians Earl Scruggs on banjo and Lester Flatt on guitar to his band, the Blue Grass Boys. This trio, along with Monroe on mandolin and a bassist, solidified the classic bluegrass lineup. Their collaboration created a distinctive sound that became foundational to the genre, blending traditional Folk Music with innovative techniques. This lineup is often credited with popularizing bluegrass music in the United States.