The latest craze among Valley bars and clubs these days isn't some overpriced fruity martini or even playing host to the hottest DJs around. Nope, it's Rock Band nights, where patrons test their mettle at the ultra-hot video game (which involves groups of three or four playing simulated instruments and singing in time to chart-busting songs like Foo Fighters' "Learn to Fly" or Bon Jovi's "Wanted Dead or Alive") for fun and the admiration of their fellow drunks. None of the trend-following nightspots offers the chance to perform like an actual rock star the way Sandbar does. Every Wednesday night, at the Peoria location, this beach-themed bar encourage groups to turn out dressed in their finest rock 'n' roll wear and engage in vampish, Steven Tyler-style onstage antics. Bar credit is awarded to the combo that gets the highest score each week. And if there are 30 or more bands competing during the event, the best-dressed act nabs $300 in cash. Groupies are optional, however.