Emmylou Harris, Patty Griffin, Shawn Colvin and Buddy Miller will tour together in early 2008. Billed as Three Girls and Their Buddy Tour, the itinerary begins Jan. 11 in Chattanooga, Tenn., and concludes Jan. 26 in Ann Arbor, Mich. In addition, all four artists will perform on the Cayamo: A Journey Through Song music cruise, which takes place Feb. 4-10. Harris is currently at work on a new album with producer Brian Ahern.