Disney World has many bands, parades, and other pop up performances. Along with the park map, a schedule of these performances is available upon entering the park. It is also viewable on the My Disney Experience app.
One of these performances in Epcot is the JAMMitors. On our last trip I made a point of catching them. I had a strong memory of them from my first trip to Disney World when I was twelve. They were just as fun as I remembered.
The premise is that they are 3 janitors on break, which is when they become the JAMMitors a three person band, using their cleaning tools (garbage cans, buckets, plungers, etc.) As I remembered it was a light, fun show. Be warned that they can get a bit loud so if you have a little one who doesn’t like loud noises stand far back.