Alison Krauss and Robert Plant have announced dates for their upcoming European tour, although details of their U.S. shows still have not been revealed. The tour kicks off on May 5 in Birmingham, England, followed by shows in Germany, Belgium, France, the Netherlands, Sweden and Norway before closing with a May 22 appearance at London’s Wembley Arena. Krauss and the Led Zeppelin vocalist performed songs from their new album, Raising Sand, during the taping of a new episode of CMT Crossroads premiering Feb. 11. Plant joined Led Zeppelin bandmates Jimmy Page and John Paul Jones for a Monday night (Dec. 10) reunion concert in London honoring the late record executive Ahmet Ertegun. The three musicians are rumored to be launching a Led Zeppelin tour in 2008.