A new stage musical version of the Mary Poppins movie involves an unusual collaboration between songwriters removed by decades. “Richard and Robert Sherman’s songs from the original film have been joined by eight new songs by George Stiles and Anthony Drewe. But it’s not quite as simple as that. Five of the film’s most iconic numbers – including Chim Chim Cher-ee, Feed the Birds and Supercalifragilistic-expialidocious – have been supplemented and extended, not by the older composers, but by the younger ones.”