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EDIT: i dont play drums so i know the drums are a little "off"
Play the drums by clicking on the drums. the arrows in the right top corner switch the background. try playing a beat to some of the songs in the top left corner. HIT STOP BEFORE STARTING A NEW SONG. There are 2 easter eggs, and you'll be able to tell when u find them. they shouldnt be too hard to find.
if anyone actually read this... try pressing the arrow keys and the end key... i wanted to program more keys, but i dont know how to program letter keys.