There is no better way to learn robotics and electronics than building your own robots. randofo has shared a guide that shows you how to build a robotic drum controlled by Arduino. It lets you slow down or speed up any drum beat with precision. In some ways, this is more reliable than a human when playing drums.
You are going to need Arduino Uno, drum set, sticks, motor, and a few other parts to get started. More info is available here.