If Led Zeppelin tours in 2008, it won't be during May: Singer Robert Plant has reserved that month for a European jaunt with Alison Krauss.

Plant, fresh off a hugely successful reunion concert with Led Zeppelin, and bluegrass star Krauss announced the European leg of their tour Thursday. It had been known that a tour was in the works, but both had been mum on details.

The Led Zeppelin show, which took place Monday at the sold-out O2 Arena in London, drew rave reviews and sparked renewed rumors that the band — with the late John Bonham's son Jason on drums — would tour.