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A simple, web-based, music making tool, inspired by Yu Nishibori and Toshio Iwai's Tenori-on instrument.
Users check squares on a 16x grid. Its vertical position determines the note, and the horizontal the time. Tunes can't be exported (though output is easy enough to record with something like Audacity), though compositions can be copied to the clipboard as strings of numbers, and pasted back into the application, and shared. The 16 note limitation doesn't make it so useful for music composition, but the ability to make by drawing (free hand, reproducing sprites, etc.) makes it a fun way to generate small melodies, stings, and probably etc.