Coachella

Black Sabbath were forced to withdraw from a headlining slot at this year's Coachella festival, it's been revealed, following their guitarist Tony Iommi's sad announcement that he suffering from the lymphoma form of cancer.

Though there hasn't been an official quote from the band itself, multiple sources have reportedly told the website Billboard.com that they were forced to cancel at the 11th hour following the news of their guitarist's ill health..

Source: http://www.contactmusic.com/news/coachella-2012-black-sabbath-withdraw-after-iommis-diagnosis_1282313