Black Sabbath guitarist Tony Iommi was going through a rough case of writer's block when the group began recording Sabbath Bloody Sabbath in 1973. It's not hard to understand why. The group had released four amazing albums over the previous four years, all built around his riffs. He was feeling tapped out.
They rented a giant castle in Gloucestershire, England to see if it would inspire them. The locals felt the place was haunted, and it had an actual dungeon. "The vibe did lift my writer's block," Iommi wrote in his memoir, Iron Man. "As soon as we started working, the first song I came up with 'Sabbath Bloody Sabbath.' First day we were there, bang! I went, 'Bloody hell!'" The nearly-six-minute song kicks off the disc. Many fans feel it was the band's last moment of true greatness until Ronnie James Dio joined the band seven years later.