One of the most unusual artistic pairings in recent years came when Alison Krauss teamed up with Led Zeppelin founder Robert Plant for the album "Raising Sand," leading to a Grammy award for the duo earlier this year.

Now Alison and Robert are set to hit the road this Saturday, kicking off the tour in Louisville, Ky., and playing dates in Europe and the U.S. through July 19, when the trek winds down in Nashville. They've also now been booked, according to Billboard, for the Austin City Limits Festival Sept. 26-28.

The two first met in person in 2002 when they played a tribute to Leadbelly sponsored by the Rock & Roll Hall of Fame in Cleveland. Particularly given the wild reputation that Zeppelin developed, Alison was surprised at just how down-to-earth Robert seemed.

"He talked about Ralph Stanley — that's like the first thing he said — and he talked about driving through the Appalachians with his long hair and hoping that nobody saw him," she told The Louisville Courier-Journal. "Just a really nice, charming, funny person, always looking to be inspired by music, and a very passionate person. I don't know anybody who doesn't get charmed by him."

Rumors have circulated for months of a possible Zeppelin reunion tour following the jaunt with Alison. If that does occur, she's not expecting to get an invite to play with Robert and the reassembled gang.

"I imagine," she laughed, "when this tour is over, he'll have had enough of me."