Dave Grohl is brilliant at covering songs (see "Darling Nikki" and "Baker Street,") but over the weekend the Foo Fighters fans at the Firefly Festival in Delaware were treated to parade cover tunes. They kicked off their encore with Alice Cooper's "School's Out" and followed it with The Rolling Stones "Miss You," Queen's "Under Pressure" and Van Halen's "Ain't Talkin' Bout Love."