Weezer

Rivers Cuomo may be kind of a weird dude, but is it possible his vegetarian diet and years as a celibate gave him the power to age backwards? At 39, Weezer's frontman parties with Lil Wayne and unabashedly sings about hot girls, his homies and, like, OMG, malls. Maybe it's his way of making up for some gangly teen years, but his and the band's geek chic is always what's made them so cool. Lyrics aside, the music within -- pop-punk treated with synths, club beats, power riffs and even some sitar -- reveals Weezer at their giddiest, most irresistibly untamed (album cover -- spot on).