Also, here's an amazing, fantastic, oh-so-great sand animation for Schubert’s “Erlkönig,” which I love love love to begin with, and this animation just literally made my day.

Watch it in full screen--ETA: contains some dark material and could potentially be triggering...
https://www.youtube.com/watch?t=285&v=1_dighphz_A

oh and this version, which blows my mind because I didn't know humans could move their hands and fingers that fast (just a video of a woman playing a piano in front of a live audience)