Cynthia May Carver, known professionally as Cousin Emmy, was a banjo player and country singer who was one of the pioneering solo female stars in the country music industry, her song "Ruby, Are You Mad at Your Man?", became a bluegrass standard after it was covered by the Osborne Brothers, were an influential and popular bluegrass act. during which time period?
Cousin Emmy:  became a bluegrass standard after it was covered by the Osborne Brothers. Osborne Brothers: The Osborne Brothers, Sonny Osborne (b. October 29, 1937) and Bobby Osborne (b. December 7, 1931), were an influential and popular bluegrass act during the 1960s and 1970s.
1960s and 1970s