“Bonnaroo, howdoyoudo?”
Brent Hinds, the curly-haired, face- tattooed co-guitarist/singer of Atlanta metal act Mastodon, is shouting, and the crowd is shouting back. It’s the second day of the annual Bonnaroo music festival in Manchester, Tenn., and Hinds and his bandmates — bassist-vocalist Troy Sanders, guitarist Bill Kelliher, drummer- vocalist Brann Dailor — have just begun a late-night set in front of a crowd packed into Bonnaroo’s This Tent. Across the way, on the considerably larger What Stage, Kanye West is wrapping up a headlining show. Hinds makes a lighthearted, and expletive-laden, remark about this as well, to even louder cheers. At another end of the campgrounds, meanwhile, Ice Cube is preparing to take the Which Stage for a run-through of his catalog of hip-hop classics.
Needless to say, the members…