Which English singer co-wrote the songs for the stage musical "The Boy in the Dress"?

"The Boy in the Dress" is a musical with music and lyrics by Robbie Williams, Guy Chambers and Chris Heath and a book by Mark Ravenhill. The musical is based on the 2008 novel of the same name, written by David Walliams. The story is about a twelve-year-old boy, Dennis, who enjoys wearing a dress and the reactions of his family and friends.

Robert Peter Williams (born 13 February 1974) is an English singer and entertainer. He found fame as a member of the pop group Take That from 1990 to 1995, but achieved greater commercial success with his solo career, beginning in 1996. Williams has released seven UK number one singles and eleven out of his twelve studio albums have reached number one in the UK. Six of his albums are among the top 100 biggest-selling albums in the United Kingdom (four albums in the top 60).