Fronted by the tattooed, pierced and suspendered Travis McCoy, Gym Class Heroes are known for hip-hop smashups with catchy choruses, and last night's show at L.A.'s Key Club — part of SPIN, adidas Originals, and Citi Private Pass’ Ruby Series partnership -- was no exception.

"I've always had this idea for a Monday night show where everyone brings in tequila," Calexico's Joey Burns told the crowd at Hollywood's Music Box. While it was indeed a Monday night, there was more Bluetooth in the room than blue agave. But thanks to Calexico's tunes, there was certainly no shortage of anything from south of the border.

"I want you to know there's no tape recorder here tonight, no backing tracks," Kid Rock told the crowd of mock-Playboy bunnies, spaghetti-western cowboys, and C-list celebrities Thursday night at Los Angeles' Gibson Amphitheater. "This isn't American Idol. This is American badass!" Indeed.