Lots of free music options - Yeehaw Bob plays over at POR several nights a week and POFQ has a duo that plays from what I've read. There is a big band that plays at Mizners at GF, there is also strolling musicians at MK, there is also the Jaminators at Epcot ( drums ) and the stages at Canada and UK have bands, Japan has drums, Mexico has wandering mariachis.
DS has a live music pavilion but Bongos and Raglan Road also have performers and music. Jellyrolls is great fun with the dueling pianos.