The white keys are the piano, the large tan circle is the snare drum, the two small tan circles are the bass drums, the yellow half circles are the hi-hat cymbal, and the yellow circle at the bottom is the crash cymbal. Use the Up and Down keys on the keyboard to change the sensitivity, and press the Left and Right keys to change the beat length.
I had an idea of musical intruments using video sensing. So I made the piano, with 7 keys. Then, I removed 2 of them and added the drums to it. I hope you like it!