If These Walls Could Sing arrives with the 90th anniversary of famed London recording studio.　　Universal Music Group’s recently-launched production house Mercury Studios has announced a documentary about Abbey Road Studios. If These Walls Could Sing will explore the legendary recording studio’s history in conjunction with Abbey Road’s 90th anniversary this November. The film is produced by John Battsek and directed by filmmaker and photographer Mary McCartney, daughter of Paul and Linda.　　“Some of my earliest memories as a young child come from time spent at Abbey Road,” Mary McCartney said in a statement. “I’ve long wanted to tell the story of this historic place, and I couldn’t be collaborating with a better team than John and Mercury Studios to make this creative ambition a reality.”…