On Wednesday afternoon, the record was playing in The Mermaid Inn in Chestnut Hill, and the bar was mostly empty except for Sparks and his wife and Quain and his daughter. The tunes - "Muskrat Ramble," "When the Saints Go Marching In," "At the Jazz Band Ball" and others - were upbeat, with wild flourishes from the trumpeters, music that rouses people out of their seats, or whatever else is holding them down.