If the program is not working properly, refresh the page. Also, it won't run well on slow computers. If you want faster music put it on turbo mode. (shift click the green flag) Turbo mode will reduce the design at the beginning, though.
THE MUSIC AT THE MENU IS SELF GENERATED! Plus, the reason it sounds Chinese is because it is using the pentatonic scale to generate music. The music is randomly generated by using a simple algorithm It seems like I haven't made a project in a long time. I first started scratch many years ago and I still don't have very many projects. This may seem like a simple program but it's more complicated than it seems. I spent a lot of time trying to reduce the code to prevent lag. The problem is that scratch does not support matrices and this program that runs on a matrix. Not to worry, I found a way around that.