NBC Hosts Open Call for Live 'Sound of Music'
A teenage girl, blond and composed, stood at the corner of the playground facing Fourth Avenue and, with a welter of parents and aspiring performers behind her, sang a song to herself and passers-by. No, this wasn’t a moment from a movie musical; it was the scene outside Grace Church School in Manhattan’s Union Square, site of the open call for Von Trapp children in NBC’s live broadcast of “Th…