“It’s been a rough couple of years for Broadway musical revivals, with a series of high-profile financial failures, including Gypsy, Man of La Mancha and Wonderful Town. What each of those shows had in common were stars like Bernadette Peters, Brian Stokes Mitchell and Donna Murphy, all of whom had respected theatrical résumés but lacked lasting box office punch. Theater fans might have cared, but the general public, it seemed, did not.” So the producers of two of this year’s most anticipated revivals are going outside the traditional theatre world for stars, hiring jazz singer Harry Connick and sitcom actress Christina Applegate in an effort to boost ticket sales.