This was a nice demonstration of letting these robotic hands learn to play a keyboard. The technique is limited due to constraints of the hands, and is closer to parts of the technique of early keyboard instruments like an organ or a harpsichord, rather than that of a modern grand piano, which requires a lot more control of the body core, shoulders, elbows, arms, and wrists with the fingers doing as minimal a motion as possible. I suppose a similar algorithm learning to play on a grand piano using a full humanoid body could learn a technique that would be exciting to analyze.