The musical is set to debut at a Nederlander Organisation theatre in March (15) and Barlow has revealed and Rubin have been collaborating on a "guest artist album" at the producer's California studio over the summer.
In a message on Twitter.com, the pop star writes, "The Legend Rick Rubin is Producing a Finding Neverland Guest Artist Album. I've spent the summer at his amazing studio in Malibu."
In addition to Barlow, pop star Jessie J has been tapped to contribute a song called Stronger, dedicated to the Boston marathon bombing victims, to the upcoming concept album.
Other singers rumoured to have tracks on the record are Alicia Keys, Taylor Swift and Jennifer Hudson, who performed the song Never Neverland at the Tony Awards in June (14).