This is the second book in the Frank Dragovic series. Suzanne, Dragovic's girlfriend gets him to try to discover who's been stealing musical instruments at an annual folk festival called "Madness." He signs up for a drumming class, and there's a lot of instrument lore, a lot about old-time American folk music, and an eccentric cast of characters, including a sheriff.
As you might expect, the stolen instruments aren't the only problem. Soon enough, there's a murder, and Dragovic is the most likely suspect. And then there's the pig. Light-hearted entertainment that you can order here.