Who shares the honors in three major music halls of fame?

Question

In the U.S. we have the Nashville Songwriters Hall of Fame, the Country Music Hall of Fame, and the Rock and Roll Hall of Fame. There are only ten performers who are in both the Country Music Hall of Fame and the Rock and Roll Hall of Fame. Out of those ten performers only three are in all three halls, who are they?

Answer 1

Johnny Cash
Jimmie Rogers
The Everly Brothers