Q: How long does it take for a rock band to go from self-releasing EPs with titles like Potatoes for Christmas and Caca Bonita to playing the main stage at Ozzfest? A: Six years. Ever since Dream Works Records caught wind of Papa Roach’s explosive demos, they’ve been infesting huge stadiums alongside legendary acts like Guns N’ Roses and Mötley Crüe. Recently, the California boys have done somewhat of a 360°, ditching the alt-rock sound they adopted after 2002’s Lovehatetragedy, to return to their nü-metal roots. On tour to promote 2009’s Metamorphosis (nice Kafka reference, dudes) the eight-legged Papa Roach invades Scout Bar on Wednesday. Hint: Don’t forget your guyliner or hair gel, but leave the Raid at home. $35, 8pm, Scout Bar, 19314 Highway 281 North, Suite 110, scoutbarsa.com, frontgatetickets.com