Green Day hit the studio.
Band's second secret show this year was documented for film about upcoming album
DVD/CD set documenting the band's stadium tour due in March
Green Day's supercharged spectacle hits Philadelphia
The scrappy punks, who became superstars 15 years ago with 'Dookie,' are now America's most ambitious rock band
Drummer talks DIY touring in a bookmobile, loving the Who and the band's bond