After canceling a proposed tour due to guitarist Tony Iommi’s health issues, Black Sabbath hinted that they would play just one U.S. gig this year. Today, the verdict has spread throughout Twitter and various blogs that the date will be at Lollapalooza in Chicago’s Grant Park, which will take place from August 3-5.

CBS Chicago reports that the blog Pretty Much Amazing published a photo image of “a pretty convincing Lollapalooza internal memo,” revealing that Sabbath will co-headline the festival, along with The Red Hot Chili Peppers, The Black Keys and Jack White.

Sabbath headlining Lollapalooza brings some tasty irony with it: Sharon Osbourne pitched Ozzy Osbourne to Lollapalooza in the ’90s and was told that he wouldn’t fit in with the tour. She then founded Ozzfest to create a tour around her husband, and it was on Ozzfest that Black Sabbath first reunited in 1997.

Black Sabbath will play one show in England this year as well, on June 10 at the Download Festival. All other Sabbath dates in Europe will be replaced by “Ozzy Osbourne & Friends” which will include Sabbath bassist Geezer Butler, Ozzy’s former guitarist Zakk Wylde on some dates, and Slash on others. There’s still no word on what Sabbath drummer Bill Ward’s involvement will be in the tour – if he has any at all. He has been publicly feuding with the band, and as of press time, isn’t involved in the recording of their upcoming studio album. In February Black Sabbath posted a message to fans saying that they “Have no choice but to continue recording without him although our door is always open.”

As for Iommi, on March 27, he posted a message to fans on his website, reporting that he’s done with chemotherapy, and about to start three weeks of radiotherapy. In January, Iommi was diagnosed with the early stages of lymphoma.

- Brian Ives, CBS Local