Conversation so far:
Can you provide some background information on Gary Barlow's involvement with musical theatre?
On 25 June 2013  Gary Barlow signed up to work on a new musical version of Finding Neverland and co-wrote the score for the project.
Did Gary Barlow start working on Finding Neverland soon after 25 June 2013?
22 songs by Gary Barlow and Eliot Kennedy. A private reading was held in September 2013 with Brian d’Arcy James as Barrie and Jason Alexander as the nagging theater producer“
Was the Finding Neverland musical successful?
The Finding Neverland musical sold out it's first show
What happened after the Finding Neverland musical was sold out?
The Finding Neverland musical sold out it's first show and posted a box office performance that, if it continued for a whole week of performances, would have topped $1 million.

Question: Are there other important aspects?
Self-contained rewrite: Are there other important aspects about the Finding Neverland musical besides the score written by Gary Barlow, working on the musical soon after 25 June 2013, and selling out its first show?