Charlie and the Chocolate Factory Wonka, Jr." and almost always featuring musical numbers by all the main characters (Wonka, Charlie, Grandpa Joe, Violet, Veruca, etc.); many of the songs are revised versions from the 1971 film. "Charlie and the Chocolate Factory" has undergone numerous editions and been illustrated by numerous artists. The cover photo of the 50th anniversary edition, published by Penguin Modern Classics for sale in the UK and aimed at the adult market received widespread commentary and criticism. The cover is a photo of a heavily made up young girl seated on her mother's knee and wearing a doll-like expression, taken by the
Willy Wonka & the Chocolate Factory to buy the rights to the book and finance the picture for the purpose of promoting a new Quaker Oats "Wonka Bar". David L. Wolper and Roald Dahl agreed that the film would be a children's musical, and that Dahl himself would write the screenplay. However, Wolper changed the title to "Willy Wonka and the Chocolate Factory". Screenwriter David Seltzer conceived a gimmick exclusively for the film that had Wonka quoting numerous literary sources, such as Arthur O'Shaughnessy's "Ode", Oscar Wilde's "The Importance of Being Earnest", Samuel Taylor Coleridge's "The Rime of the Ancient Mariner" and William Shakespeare's "The Merchant