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?
{'answer': '1960s and 1970s', 'supporting_facts': [['Cousin Emmy', 4], ['Osborne Brothers', 0]]}