“We were the age of the kids when we wrote it,” said composer Dan Redfeld, speaking before Sunday’s concert performance. “Now we’re coming back to it at the age of the adults.”“Jo – The Little Women Musical” began when Redfeld saw and loved the 1994 film of “Little Women”, starring Winona Ryder as the young heroine Jo March and Susan Sarandon as her mother Marmee. “As you do in youth theatre,” Redfeld said, he thought: “Let’s write a musical.”Together with lyricists Christina Harding and John Gabriel Koladziej, he did. The West End premiere was preceded by an album, released last year, and recordings at London’s Abbey Road Studios, where The Beatles and so many others have gone before. For everyone in the show, Abbey Road Studios is a setting they never take for granted.