Play Live Music
You would think that this robot was just programmed to do such motions if you watched it play the strange theremin instrument from the Soviet era, which is played exclusively with hand gestures in the air. It's interesting that it wasn't; created by scientists at Kyoto University's Graduate School of Informatics, the robot is fully autonomous when it comes to reproducing music. It can also perform in ensembles with other musicians, complete with visual indications and tempo adjustments based on the music being played by their partner.
Roboticists all over the world are experimenting in a variety of ways with live music and robots. There are numerous videos online showcasing robot rock bands that can perform at least as well as live musicians. Because you may create robots anyway you want, and because they never grow tired, they are intrinsically more dependable and technically capable. Robots still aren't able to create music, though, since that still requires the human brain and the unique way it hears music.