Def Leppard toured extensively in 2005 to support its two-disc best-of set, "Def Leppard--Rock of Ages: The Definitive Collection." The group's long-delayed covers album, "Yeah"--which originally was scheduled for release in September of last year, but was pushed back while the group went through a management change--is expected to surface in mid-May.

"Only six months between tours for Def Leppard...this is amazing...WOW," Def Leppard guitarist Phil Collen said in a statement. "I think we're getting the hang of this! Usually, we always have to redefine and reorient ourselves to touring as we are used to a three-year gap between tours because of the recording process. This time, we had the album in the can so we are good to go. We're really psyched to be hitting the road this summer and are looking forward to seeing all of our fans again."

Def Leppard and Journey are both members of an exclusive list of artists who have seen at least one of their albums get certified Diamond by the Recording Industry Association of America, signifying sales of 10 million copies. Leppard accomplished that feat with 1983's "Pyromania" and 1987's "Hysteria," while Journey scored the award for its 1988 best-of set, "Journey: Greatest Hits.

"[Def Leppard is] a band I've admired for a long time," Journey keyboardist Jonathan Cain added. "We're honored to be performing with a band that received their Diamond Award at the same ceremony when we received our Diamond Award. So it seems fitting that we go out together after all these years and celebrate a lot of good years of rock and roll."

Journey continues to back last year's "Generations," its 13th studio album. Produced by Kevin Elson--who also produced Journey's multi-platinum "Escape," "Departure" and "Frontiers" albums, as well the double-platinum live set "Captured"--"Generations" is the band's first collection of all-new material since its 2002, four-song EP, "Red 13."