Topic summary
Progressive bluegrass

Extracted from the Wikipedia article Bluegrass music.
Progressive bluegrass
The group the Country Gentlemen is credited with starting the progressive bluegrass movement with their 1960 album Country Songs, Old and New, combining traditional ballads such as "The Little Sparrow", "Weeping Willow" and "Ellen Smith" with traditional bluegrass instrumentation and "bouncy" mandolin and banjo parts distinct from those of traditional players such as Monroe and Scruggs.