With snappy, three-chord songs driven by effectively unshakable rhythms and squinty-faced vocals, Green Day have set the standard for punk-pop. Though the genre existed before their time, this Bay Area trio -- under the tutelage of Lookout! Records co-founder Larry Livermore -- helped resurrect the catchy, two-and-a-half-minute pop song. Green Day came together at a time when Berkeley, Calif., was bubbling with new bands who were blowing air into punk's gasping lungs. They quickly b...  [+]