Question: Who wrote the book on which a musical was based which featured the song She Used to Be Mine?
Sentence (from "She Used to Be Mine (Sara Bareilles song)"): "She Used to Be Mine" is a song written and recorded by American singer-songwriter Sara Bareilles for her fifth studio album, "" (2015), featuring songs from her stage adaptation of the 2007 film, "Waitress".
Relevant evidence: Yes