Gielgud theatre; Prince Edward theatre, LondonSheridan Smith captivates, if the songs don't quite, in Ivo van Hove and Rufus Wainwright's new musical, while Christopher Wheeldon and Lynn Nottage tread carefully with the gloriously danced story of Michael Jackson Ivo van Hove is a director who gives his audiences the illusion of privileged access " the thrilling sense that he is showing his workings; that even behind-…