This tuneful documentary takes viewers behind the scenes at the casting of a 2007 Broadway revival of A Chorus Line. Funny thing is A Chorus Line is a behind-the-scenes look at the casting of a big Broadway musical. The film's directors mostly focus on the "American Idol"-like auditions, giving this a clever, self-referential slant. Interspersed tidbits concerning A Chorus Line's creation make this a must for fans of musical theater. 96 minutes PG-13.