Black Sabbath have put their upcoming reunion tour on hold due to guitarist Tony Iommi’s ongoing battle with lymphoma. The band will now perform only one show from this summer’s previously scheduled European tour, taking place Sunday, June 10 at the U.K.’s Download Festival.

In place of the tour, Ozzy Osbourne will now perform the majority of the previously scheduled Sabbath dates billed as Ozzy & Friends. These shows will feature appearances by special guest musicians including Geezer Butler and longtime former Ozzy band member Zakk Wylde. In addition, Slash will join the group at select shows, with other “special guests” set to join the tour at various stops along the way.

According to the press release, Tony Iommi continues to make excellent progress and is looking forward to getting back out on the road.

The 2012 tour dates are as follows:

Black Sabbath

6/10 Donnington, UK—Download Festival

Ozzy and Friends

5/23 Helsinki, Finland Hartwall Arena
5/25 Stockholm, Sweden Stadium
5/27 Jelling, Denmark Jelling Festival
5/29 Bergen, Norway Bergen Calling Festival
5/31 Oslo, Norway Spektrum
6/2 Malmo, Sweden Malmo Stadium
6/4 Dortmund, Germany Westfalenhalle
6/6 Prague, Czech Rep O2 Arena
6/15 Vitoria, Spain Azkena Rock Festival
6/17 Clisson, France Hellfest
6/22 Dessel, Belgium Graspop Metal Meeting
6/24 Milan, Italy Gods of Metal Festival
6/26 Vienna, Austria Stadthalle
6/28 Belgrade, Serbia USCE Park
7/1 Athens, Greece Rockwave Festival – Terra