Robert Plant and Alison Krauss have added a series of nine dates, mostly on the West Coast, to their Raising Sand tour. The new dates are Sept. 23 in Kansas City, Mo.; Sept. 24 in St. Louis; Sept. 26 in Houston; Sept. 27 in Austin, Texas; Sept. 30 in Portland, Ore; Oct. 1 in Seattle; Oct. 3 in San Francisco; Oct. 4 in Kelseyville, Calif., and Oct. 5 in Saratoga, Calif. The duo released the critically acclaimed Raising Sand album in 2007. They will perform in Nashville on Saturday (July 19).