Press 1, 2, 3, 4, 5, 6, 7, 8, 9, 0, Q, W, E, R, T, and Y keys to play music. Also press the green button to change to background. As of right now, there are 8 backgrounds. You can also press the S key to stop the current music playing.
here's the cool site that provided all the music https://downloads.khinsider.com/
