Country star Willie Nelson wants to join THE Rolling Stones if they embark on another world tour. The CRAZY star is still recording and touring aged 73, and would love to team up with his pal Keith Richards for a series of live shows. He says, "They like country music, we get along fine and Keith (Richards) is a good buddy of mine, so that would be good. "We've talked about it for years and it's just hasn't ever happened."