Toeing the line between upscale dance hall and bubbling cauldron of underground talent, Commonwealth Lounge is one of the few bars that bends the parameters of rock & roll in as many ways as the law allows. A fervent harvest of psychedelic '60s revivals, guitar-tapping prog artists and Latin-flavored jam bands is a blessed, regular occurrence. Not to mention that such talent balances well with the club's cavalcade of notable funk and hip-hop acts. Commonwealth's loud, eclectic palette is especially pleasing considering the bar's recent evolution. In the past year, it has gone from a well-decorated Top 40 zone to a respected cove of indie culture. (It's still well-decorated, too.) Tucked into a red-brick plaza at the southern tip of downtown Fullerton, its sleek, neon-lit lounge vibes collide with old-fashioned East Coast swagger and flowering chandeliers. Add a couple of stiff drinks and a dance floor packed with Fullerton's most attractive clientele, and you won't find a classier, more adventurous place to bang your head.