Question: The writer of the lyrics for the musical "Rex" collaborated with what composer on "Fiddler on the Roof"?
Sentence (from "Sheldon Harnick"): Sheldon Harnick (born April 30, 1924) is an American lyricist best known for his collaborations with composer Jerry Bock on musicals such as "Fiddler on the Roof".
Relevant evidence: Yes