YOUNG PRISMS Friends for Now myspace.com/youngprisms On its own, each element that makes up Young Prisms’ debut would sound monotonous, abrasive or both. The bass and drums throb pleasantly enough, ramping up old-school girl-group rhythms, but the guitars drone like amplified vacuum cleaners and the two singers do little more than howl into the sonic tornado. But when these wily San Franciscans put all these elements together they get songs like...