The percussionist shared the news during an appearance on Rick Rubin's Tetragrammaton podcast. Shawn “Clown” Crahan of Slipknot speaks during KROQ Friday Night Live at Los Angeles Comic Con at Los Angeles Convention Center on December 1, 2023 in Los Angeles. Chelsea Guglielmino/Getty Images Trending on Billboard Slipknot ’s M. Shawn Crahan says he will need heart surgery after being diagnosed with a cardiac condition following the metal band’s recent tour. The 56-year-old percussionist, better known as Clown, shared the news during an appearance on Rick Rubin ’s Tetragrammaton podcast, which was posted to YouTube on May 7. Explore See latest videos, charts and news In the wide-ranging interview, Crahan — Slipknot’s sole remaining founding member — explained that he sought medical attention after not feeling well following the tour, where doctors discovered an issue with his heart’s electrical system. “I have a skipping heart and I got to get a surgery,” Crahan told Rubin.…