The moment is burned into the mind of Roadrunner Records president Jonas Nachsin.

It was 1999, and his label had convinced Ozzfest organizers to put its newly signed band, Slipknot, on the festival's second stage.

Curious to see the band in action before its debut album dropped, Nachsin took a drive to New Jersey, where Ozzfest was playing at the PNC Bank Arts Center in Holmdel. While hard rock acts Black Sabbath, Slayer, Rob Zombie, System of a Down, Deftones and Godsmack attracted the masses, then-unknown Slipknot took the side stage before a respectable audience of about 200.

And then, Slipknot ripped into its set.

"People were running down the hill," Nachsin recalls. "They heard this cacophonous noise in the background and decided that they literally needed to run and go see what was going on. Those moments are incredibly rare, not just in hard rock or metal, but in music in general."

Nearly a decade after its debut at Ozzfest, Grammy Award winner Slipknot has moved to the top of its genre, where the act is now co-headlining one of this summer's most anticipated hard rock tours, the inaugural Rockstar Energy Drink Mayhem Festival, which launched July 9 at the White River Amphitheatre in Auburn, Wash.

The timing of the 30-date Mayhem trek couldn't arrive at a better time for Slipknot, which will release its fourth studio album, "All Hope Is Gone," Aug. 26 via Roadrunner.

Click here to read more about Slipknot's global push, which includes deals with AOL, Hot Topic, MTV, overseas touring and yes, teasers for the band members' new masks.