Radiant Spincrystals

The teapot has a system that allows you to change the background music through these yellow “pineapple rings”. To do so, you need to buy a furnishing called “Euphonium Unbound: Winding” or “Euphonium Unbound: Soaring” from tubby, place them and interact with it.

You can obtain these spincrystals in two ways, one is buying them from Travelling salesman which comes from Friday-Sunday or obtaining them in the overworld. Currently there are 87 Spincrystals that is obtainable that you can see here.