The Osborne Brothers, Sonny and Bobby, were an influential and popular bluegrass act during the 1960s and 1970s and until Sonny retired in 2005. They are probably best known for their No. 33 1967 country hit song, "Rocky Top", written by Felice and Boudleaux Bryant and named after a Tennessee location. Bobby & Sonny Osbrone Brothers have Dual Signed This 1992 Tenny Trading Card. Bold black pristine signatures. Athlon Sports Collectibles Certificate of Authenticity. Image of actual item in stock - as shown