Going strong since 1940, this gospel and country quartet have recently been inducted into the Country Music Hall of Fame. Celebrated for songs such as "Elvira", "Bobbie Sue", and "American Made", the group continually tour and perform, even collaborating with newer artists, as they did in 2015 with a new recording of Elvira with 2013 Sing-Off winners, acapella group Home Free.

Going strong since 1940, this gospel and country quartet (composed of Joe Bonsall, Duane Allen, William Lee Golden, Richard Sterban) were inducted into the Country Music Hall of Fame in 2015. Celebrated for songs such as 'Elvira', 'Bobbie Sue', 'Touch a Hand, and Make a Friend', 'Gonna Take a Lot of River' and 'American Made', the group continually tour and perform, even collaborating with newer artists.