A piano study

"The First Quarter-­Second of the Chopin G-­minor Ballade" by Matt Grayson, a commenter on Dorigo's site. If you're not mathematically inclined, don't let the differential equations scare you off; you can follow what's going on without them.

Spoiler--he's looking at the tones produced by the first couple of notes, and in the process learns about effects from the piano wire structure. Nicely done.