Question: 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?
Sentence (from "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.
Relevant evidence: Yes