The Music Man
In the second act, it's looking good for Hill.  He is actually getting somewhere with Marian, and it looks as though he will be able to collect his money and get out of town.  However, anvil salesman Charlie Cowell shows up and exposes him during the summer sociable.  Hill tries to leave, but he cannot because he is too in love with Marian.  Hill is arrested and is almost tarred and feathered before being forced to conduct the band.  Though the band is not very good, the townspeople are still very proud of it and let Hill go.