Carrie Underwood, Vince Gill, Craig Morgan and Rodney Atkins are the first country artists announced to play in the 17th annual City of Hope Celebrity Softball Challenge at Nashville's Greer Stadium. The game takes place June 7, the day the CMA Music Festival kicks off in downtown Nashville. The festival continues through June 10. The softball game benefits City of Hope, a leading research and treatment center for cancer, diabetes and other life-threatening diseases. Tickets to the game and the CMA Music Festival are available at all Ticketmaster outlets.