Rascal Flatts will headline the inaugural Music for Champions benefit event on March 19 at the Hard Rock Live in Orlando, Fla. The concert will launch the 34th annual Arnold Palmer Invitational golf tournament, and all concert proceeds will benefit the Arnold Palmer Hospital for Children and the T.J. Martell Foundation for leukemia, cancer and AIDS research. An additional performer will be announced within the next few weeks. Tickets are now available for $50. Rascal Flatts' new album, Changed, will be released on April 3.