act opening, a comedy number following the pogrom just before intermission. The village men consider letters from relatives who've emigrated to America — "who needs America!" they sing — always circling back to a bouncy ditty about their obstinate, Orthodox little shtetl, "where pigs roam through the street." (Bock sets it with musical fills in the accompaniment that suggest 19th-century Russian vaudeville.) Long after the song was cut, Robbins instructed the boys to write a slower, melancholy version of the bouncy ditty, and there was "Anatevka." And then there's one of the prettiest of all Bock and Harnick songs: "Dear, Sweet Sewing Machine" for Motel and Tzeitel, a good example of a perfect song that they discovered didn't quite fit in the final version of the show.

There's plentymore to be mined on "Hidden Treasures" — including a typically Harnickian line in a song for the Brando-like antihero of the Passionella section of The Apple Tree, who instructs the Marilyn Monroe-like movie star to "learn to be like Brecht, man — use your intellecht, man!"

(Steven Suskin is author of "Show Tunes," "The Sound of Broadway Music: A Book of Orchestrators and Orchestrations," "Second Act Trouble," the "Opening Night on Broadway" books, and "The Book of Mormon: The Testament of a Broadway Musical." He also writes the Aisle View blog at The Huffington Post. He can be reached at Ssuskin@aol.com.)