I've put this in Human Science because I believe I've managed to show, to the satisfaction of an audience of one namely myself, that Bach's Chromatic Fantasia and Fugue is an algorithm. You can learn parts of this piece, like say the first dozen or so bars, and eff about on a guitar with them. I just made up a tune which I can now remember how to play and which is based on Bach's (harmonic) idea. I first learned how to play a couple of pages of the Fantasia on the guitar. So my invention is like me using chord progressions that are also in Bach's work. Essentially it's about which changes (of key) are harmonically a good fit with the key, Dm, he wrote it in.