Who founded the radio show that The Carter Sisters joined in 1950 ? 
Anita Carter:  The trio joined the "Grand Ole Opry" radio show in 1950 (Anita was 17 years old at the time), opened shows for Elvis Presley, and joined "The Johnny Cash Show" in 1971. Grand Ole Opry: The Grand Ole Opry is a weekly country-music stage concert in Nashville, Tennessee, which was founded on November 28, 1925, by George D. Hay as a one-hour radio "barn dance" on WSM.
i don't know