haha I decompiled their jar the other day actually, and they basically just combined abc4j with the YIN method of finding fundamental frequency for sound and, a

haha I decompiled their jar the other day actually, and they basically just combined abc4j with the YIN method of finding fundamental frequency for sound and, a table between frequencies and notes. I doubt it works nearly as well as most alternatives, because they made no provisions for noise in the signal or other complications. Very simple implementation even by hackathon standards, but it was presented like magic so I'm not surprised they wowed the judges. One of the team members even said this though "We just used Java, which is really basic programing. We didn’t even use fancy web app stuff, which is why we didn’t expect this at all. I don’t even know what to say about this" -theDP