SPECIAL: In 2013, NBC jump-started the new generation of live televised theater productions with its revival production of The Sound of Music, starring Carrie Underwood as Maria and Stephen Moyer (from True Blood) as Captain Von Trapp. The Shows Must Go On, until now, have been devoted to the musicals of website backer Andrew Lloyd Webber, but for this new offering – available only through the weekend, starting at noon ET Friday – the menu has expanded. This perha