The members of Diamond Rio have written an autobiography of the band, Beautiful Mess, which will be available from Thomas Nelson on Sept. 22. That same day, the band will release a new Christian album, The Reason, on Word Records. The first single from the album is "God Is There." Diamond Rio's No. 1 country hits include "Meet in the Middle," "How Your Love Makes Me Feel," "One More Day," "Beautiful Mess" and "I Believe."