Onstage and Behind the Scenes at the 2012 Rock the Bells Music Festival

Nas performs during the 2012 Boost Mobile and Guerilla Union Rock the Bells Music Festival Powered by Blackberry at Shoreline Amphitheatre in Mountain View, California on August 26th, 2012.

Common performs during the 2012 Boost Mobile and Guerilla Union Rock the Bells Music Festival Powered by Blackberry at Shoreline Amphitheatre in Mountain View, California on August 26th, 2012.

Slick Rick hangs out backstage during the 2012 Boost Mobile and Guerilla Union Rock the Bells Music Festival Powered by Blackberry at Shoreline Amphitheatre in Mountain View, California on August 26th, 2012.

Atmosphere hangs out backstage during the 2012 Boost Mobile and Guerilla Union Rock the Bells Music Festival Powered by Blackberry at Shoreline Amphitheatre in Mountain View, California on August 26th, 2012.

Redman performs with The Hit Squad during the 2012 Boost Mobile and Guerilla Union Rock the Bells Music Festival Powered by Blackberry at Shoreline Amphitheatre in Mountain View, California on August 26th, 2012.

Zion I and the Grouch perform during the 2012 Boost Mobile and Guerilla Union Rock the Bells Music Festival Powered by Blackberry at Shoreline Amphitheatre in Mountain View, California on August 26th, 2012.

Slick Rick performs during the 2012 Boost Mobile and Guerilla Union Rock the Bells Music Festival Powered by Blackberry at Shoreline Amphitheatre in Mountain View, California on August 26th, 2012.

Big Daddy Kane backstage during the 2012 Boost Mobile and Guerilla Union Rock the Bells Music Festival Powered by Blackberry at Shoreline Amphitheatre in Mountain View, California on August 26th, 2012.

Bone Thugs-n-Harmony hang out backstage during the 2012 Boost Mobile and Guerilla Union Rock the Bells Music Festival Powered by Blackberry at Shoreline Amphitheatre in Mountain View, California on August 26th, 2012.

MC Supernatural performs during the 2012 Boost Mobile and Guerilla Union Rock the Bells Music Festival Powered by Blackberry at Shoreline Amphitheatre in Mountain View, California on August 26th, 2012.

Mix Master Mike backstage during the 2012 Boost Mobile and Guerilla Union Rock the Bells Music Festival Powered by Blackberry at Shoreline Amphitheatre in Mountain View, California on August 26th, 2012.

Atmosphere performs during the 2012 Boost Mobile and Guerilla Union Rock the Bells Music Festival Powered by Blackberry at Shoreline Amphitheatre in Mountain View, California on August 26th, 2012.

Nas performs during the 2012 Boost Mobile and Guerilla Union Rock the Bells Music Festival Powered by Blackberry at Shoreline Amphitheatre in Mountain View, California on August 26th, 2012.

Deltron 3030 performs during the 2012 Boost Mobile and Guerilla Union Rock the Bells Music Festival Powered by Blackberry at Shoreline Amphitheatre in Mountain View, California on August 26th, 2012.

Murs and Fashawn perform during the 2012 Boost Mobile and Guerilla Union Rock the Bells Music Festival Powered by Blackberry at Shoreline Amphitheatre in Mountain View, California on August 26th, 2012.

Common hangs out backstage during the 2012 Boost Mobile and Guerilla Union Rock the Bells Music Festival Powered by Blackberry at Shoreline Amphitheatre in Mountain View, California on August 26th, 2012.

Dom Kennedy poses backstage during the 2012 Boost Mobile and Guerilla Union Rock the Bells Music Festival Powered by Blackberry at Shoreline Amphitheatre in Mountain View, California on August 26th, 2012.

ASAP Rocky backstage during the 2012 Boost Mobile and Guerilla Union Rock the Bells Music Festival Powered by Blackberry at Shoreline Amphitheatre in Mountain View, California on August 25th, 2012.

Biz Markie hangs backstage during the 2012 Rock the Bells Music Festival at Shoreline Amphitheatre in Mountain View, California on August 25th, 2012.

Dipset backstage during the 2012 Rock the Bells Music Festival at Shoreline Amphitheatre in Mountain View, California on August 25th, 2012.

Dipset performs during the 2012 Rock the Bells Music Festival at Shoreline Amphitheatre in Mountain View, California on August 25th, 2012.

DJ Lance Rock of Yo Gabba Gabba prepares to go onstage during Rock the Bells 2012 at the Shoreline Amphitheatre in Mountain View, California on August 25th, 2012.

DMX performs for a sea of fans during the 2012 Rock the Bells Music Festival at Shoreline Amphitheatre in Mountain View, California on August 25th, 2012.

Ice Cube backstage during the 2012 Rock the Bells Music Festival at Shoreline Amphitheatre in Mountain View, California on August 25th, 2012.

Ice Cube onstage during the 2012 Rock the Bells Music Festival at Shoreline Amphitheatre in Mountain View, California on August 25th, 2012.

J. Cole performs during the 2012 Rock the Bells Music Festival at Shoreline Amphitheatre in Mountain View, California on August 25th, 2012.

Kendrick Lamar and Black Hippy hang out backstage before performing at the 2012 Rock the Bells Music Festival at Shoreline Amphitheatre in Mountain View, California on August 25th, 2012.

Kendrick Lamar and Black Hippy perform at the 2012 Rock the Bells Music Festival at Shoreline Amphitheatre in Mountain View, California on August 25th, 2012.

Kid Cudi performs during the 2012 Rock the Bells Music Festival at Shoreline Amphitheatre in Mountain View, California on August 25th, 2012.