The hall's newest members are being honored Sunday in a musical salute featuring Garth Brooks, Reba McEntire, George Jones, Alison Krauss and many more.
Clark is probably best known for co-hosting the long-running TV show "Hee Haw," but he also had top 10 hits with "Tips of My Fingers" and "Yesterday When I Was Young."
Mandrell's many hits include "Midnight Oil," "Sleeping Single in a Double Bed" and "I Was Country When Country Wasn't Cool."
In 1980 she joined sisters Louise and Irlene to host "Barbara Mandrell and the Mandrell Sisters" on NBC.
McCoy is best known for his harmonica work and has recorded with many well-known artists.