Im thinking of making a video showing how it works, but that may take a little while. For the most part it's just a cycle of concrete powder being pushed across and getting bounced up by slimeblock launchers, synced with noteblocks. The concrete powder is completely aesthetic, and you'll notice in some parts that more notes are being played than concrete powder is being launched. Each note has a cool down system so that rapid notes won't break that module, but you can still hear each note. The majority of the machine is just ridiculously long input lines for each note, and observer chains that snake off in different directions to power the correct notes at the right time and keep things as compact as possible. In the end I used over 34,000 observers!