The next day, Mayor Shinn and his overbearing wife Eulalie MacKecknie Shinn lead the festivities for Independence Day at the high school gym ("Columbia, the Gem of the Ocean") but are interrupted by a firecracker set off by troublemaker Tommy Djilas. Harold takes the stage and announces to the townspeople that he will prevent "sin and corruption" from the pool table by forming a boys' band ("Ya Got Trouble /Seventy-Six Trombones"). Mayor Shinn, who owns the billiard parlor, tells the bickering school board to get Harold's credentials, but Harold gets them to sing as a Barbershop Quartet to distract them ("Ice Cream/Sincere"). Harold also sets up Zaneeta, the mayor's eldest daughter, with Tommy, and persuades Tommy to work as his assistant. After another rejection by Marian, Harold is determined to win her ("The Sadder But Wiser Girl"). The town ladies are very excited about the band and the ladies' dance committee that Harold plans to form. He mentions Marian, and they imply (falsely, it turns out) that she had an affair with a now-deceased miser, who willed the library building to the town but left all the books to Marian. They warn Harold that she advocates "dirty books" by "Chaucer, Rabelais and Balzac" ("Pick-a-Little, Talk-a-Little"). The school board arrives to review Harold's credentials, but he leads them in song and slips away ("Goodnight, Ladies").