Dave Grohl performs with the Foo Fighters at the Global Citizen Festival in Central Park in New York on Saturday, Sept. 29, 2012, in New York. (Evan Agostini/Invision/AP)

Photo by: Evan Agostini

Dave Grohl performs with the Foo Fighters at the Global Citizen Festival in Central Park in New York on Saturday, Sept. 29, 2012, in New York. (Evan Agostini/Invision/AP)