They might not have Jim Root on tour with them, but Stone Sour busted out a Metallica cover while in Denver. Saying “without Metallica, every single band in the last 20 years wouldn’t be here,” Corey Taylor introduced the song. With Root sitting out the tour to work on the next Slipknot album, Christian Martucci is filling in on guitar. The band’s monthlong tour with Pop Evil and Stolen Babies finishes on Saturday (15).