With the sudden news this morning that Black Sabbath guitarist Tony Iommi is battling lymphoma, several of his rock peers have already taken to Twitter to offer the heavy metal legend their best wishes. Rock acts such as Anthrax, Slash, Disturbed's David Draiman, Sebastian Bach and others were as shocked by the news as Sabbath's fans were upon hearing it today (Jan. 9). While doctors caught the lymphoma in its early stages, it will still be a tough battle for Iommi ahead. See what messages these rockers wrote for Iommi and offer your own well wishes in the comments section below: