we talked about the interface of Guitar Hero in class and found other examples of musical interfaces and notation in more obscure rhythm games, w/ alternatives to linear notation "Chrono Circle" is a Japanese arcade game w/ a radial interface for reading (notes emerge from the center point and hit the edges, or the axis of play can circle like a clock). The control mechanism is a combo of physical buttons on the edges, you can rotate those buttons radially https://youtu.be/JEqFfdQa8K8?t=73