After townspeople of River City describe their reserved, "chip-on-the-shoulder attitude" ("Iowa Stubborn"), Harold sees his old friend and shill, Marcellus Washburn, who has "gone legit" and now lives in the town. Marcellus tells Harold that Marian Paroo, the librarian who gives piano lessons, is the only trained musician in town. He also informs Hill that a new pool table was just delivered to the town's local billiard parlor so, to launch his scheme, Harold convinces River City parents of the "trouble" that can come from a pool table ("Ya Got Trouble"). Harold follows Marian home, attempting to flirt with her, but she ignores him. Marian gives a piano lesson to a little girl named Amaryllis while arguing with her widowed mother about her high "standards where men are concerned"; she mentions the man who followed her home ("Piano Lesson/If You Don't Mind My Saying So"). Marian's self-conscious 10-year-old brother Winthrop arrives home. Amaryllis, who secretly likes Winthrop but teases him about his lisp, asks Marian to whom she should say goodnight on the evening star, since she doesn't have a sweetheart. Marian tells her to just say goodnight to her "someone" ("Goodnight, My Someone").