OVER the last few months the four Filipino-American R&B singers from the San Francisco Bay Area known as Legaci have appeared on some of the biggest stages of American pop. There they were, belting perfect four-part harmony on “Saturday Night Live,” finger-snapping and line-dancing like the Temptations on “The View,” “Ellen” and “Today,” and crooning to a hysterical, sold-out crowd of 15,000 at the annual KIIS-FM Wango Tango blowout in Los Angeles. (They took the stage just after Kesha and Adam Lambert, just before Ludacris and Usher.) Read the full story