Bricusse's decision is due to "creative differences with the show's producer and director," according to a press statement.

As previously announced, producer David Shor is developing Sleepless in Seattle — The Musical through his entity Sleepless in Seattle Management, LLC.

Jeff Arch, who penned the film's original story and co-wrote the Oscar-nominated screenplay with Nora Ephron and David Ward, will write the musical's libretto. Joel Zwick — who helmed the mammoth hit "My Big Fat Greek Wedding" — will direct.

Bricusse was to have written the score with orchestrations and arrangements by Ian Fraser. The original March announcement stated that 18 songs had already been written for the musical.

Among Bricusse's upcoming projects are the original musical Sammy — based on the life of Sammy Davis, Jr. — which makes its world premiere in September at the Old Globe Theatre in San Diego; and the opening of the U.K. revival of his musical Scrooge.