Tenderloin is a musical with a book by George Abbott and Jerome Weidman, lyrics by Sheldon Harnick, and music by Jerry Bock, their follow-up to the highly successful Pulitzer Prize-winning Fiorello! a year earlier. The musical is based on a 1959 novel by Samuel Hopkins Adams. Set in the Tenderloin, a red-light district in 1890s Manhattan, the show's story focuses on Reverend Brock, a character loosely based on American clergyman and social reformer Charles Henry Parkhurst.