One of the unlikeliest (to these ears) musical pairings in recent years happens tonight at the World Financial Center. Mark Oliver Everett (the E in Eels), a veteran singer-songwriter who’s suffered more earthly despair than you have, is paired up with Smoosh, the groovy smiley teen girl pop/rockers. So, whadya think the crowd will look like? A mix of bearded old guys and teenage girls? Count me in!