Robert Plant and Alison Krauss will be on tour together for the first time in 13 years next summer when they team up for a joint outing in the U.S. and Europe behind a new album that comes out today, "Raise the Roof.". The tour isn't an extensive one, at least as currently announced. In America, Plant and Krauss are due to only play 10 dates, all in the eastern U.S., Midwest or South..