Absolute metal monsters Mastodon were unleashed on the Tennessee campgrounds of this year's Bonnaroo festival.

Despite the fact that the band used only 45 minutes of their allotted 75 minute timeslot, the energy and propulsion the Gainesville, FL punk band put behind their raucous performance was undeniable to everyone one the crowd -- even those who had clearly never heard of the sweat-drenched four-piece.