Question: Finishing the Hat, a book by American musical theatre composer and lyricist Stephen Sondheim, contains the lyrics from which musical Sondheim collaborated with Burt Shevelove?
Sentence (from "Six by Sondheim"): The film was directed and co-produced by James Lapine, based on an idea by Frank Rich and "centers on the backstory of six great Sondheim songs."
Relevant evidence: No