Rupert Christiansen: “The glut of hugely successful shows – Mamma Mia!, Let It Be, Thriller, Jersey Boys, The Commitments – which effectively trade on nostalgia is rather depressing. Even more significant is the undeniable truth that the scores of the more recent crop of successful ‘original’ musicals – The Lion King, Billy Elliot, The Book of Mormon, Charlie and the Chocolate Factory, Matilda, Wicked – are their weakest element. Has one of them yielded a single song which has passed into the general consciousness?” (Maybe “Hakuna Matata”?)