This is a simple two micro-servo and Arduino Uno controlled drum machine or robot. The servos are mounted on an L-shaped bracket of wood that is held to the snare drum with 4 strong magnets. The servo arms are bolted to two chopsticks which serve as the drum-sticks. It is quite loud but not too loud. Much louder hits could be obtained by using standard size servos and real drum-sticks which are quite a bit heavier. But that would also require a separate power supply for the servos. By using micro-servos the Arduino supplies enough current to power them directly without a separate power supply. More details and photos here: https://www.instructables.com/id/Arduino-Servo-Drum-Machine/
https://www.youtube.com/watch?v=13lp3OkpRu4Requests?
Do you take requests? The start of Marilyn Manson’s “The Beautiful People”? 
Any plans to add additional robotic players?
I program a few simple rhythms to accompany myself on guitar and ukulele. Working on a couple new Arduino projects. Hope to get something working soon. Thanks for your hard work on this forum.
I’m a musician too and this inspire me!
Nice work.
Getting around to replying to older comments. Thanks. This is one project where I actually use it sometimes to accompany myself. It is fun to create some new rhythms. Am working on a blues song today in fact.
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I have used Arduino Uno but never with drum like this for music. This is really nice. I’ll try is also.