Rather than bringing his solo band to all of this summer's Ozzfest [ tickets ] dates, tour namesake Ozzy Osbourne [ tickets ] instead will handle vocals for Black Sabbath [ tickets ] during much of the outing.

According to the tour's publicist, Black Sabbath--which will feature original members Osbourne, Tony Iommi and Geezer Butler, as well as well as Osbourne solo-band member Mike Bordin on drums--will play 26 Ozzfest dates, starting on July 10 in Hartford, CT.

Black Sabbath [ tickets ] is supporting its new eight-CD/one DVD box set, "Black Box: The Complete Original Black Sabbath (1970-1978)." The Ozzfest [ tickets ] dates will mark the band's first live appearances since 2001.

Besides Osbourne or Black Sabbath, this year's Ozzfest main stage will feature '80s rockers Judas Priest [ tickets ] (fronted by Rob Halford for the first time in a decade), Slayer [ tickets ], Dimmu Borgir, Superjoint Ritual (featuring Phil Anselmo) and Zakk Wylde's Black Label Society.

The second stage will sport a lineup of Slipknot, Hatebreed, Lamb of God, Atreyu and 10 other acts.

Ozzfest founder--and Osbourne's wife/manager--Sharon Osbourne said in a statement that fans will have a full day to look forward to when the tour touches down in their city.

"The music starts at 9:30 a.m. and doesn't stop until Ozzy leaves the stage at 11:00 p.m.," she said. "What they get is 20-plus bands, 13 and a half hours of non-stop music on two stages, and enough rock insanity to last them until the next year for about the same amount they'd pay to get into [Six Flags] Magic Mountain [amusement park]. And seeing Ozzy onstage is a better ride than any f---ing rollercoaster."

This year's Ozzfest production will require 20 trucks, 40 buses and 525 crew members, according to promoter Clear Channel Entertainment.