SongTapper
SongTapper.com is a cool AI application/demo/toy — tell users what song they’re trying to remember by having them tap the spacebar to the song’s beat. Their system is based on research [PDF] that the authors performed at Simon Fraser University and presented at AAAI05. The online system also seems to be able to learn new songs, which is very cool and might let it bootstrap it’s way into becoming a useful (or at least fun) tool. I’m not sure if it learns new songs by having the authors add additional MIDI files, or if it learns from the actual tapped rhythms. The later would be cooler, and certainly would be possible with some machine learning.