MIDI Glockenspiel. Using an Arduino make a computer controller MIDI Glockenspiel. Mike writes -

This project first saw the light of day at Christmas 1993 as my 124th constructional article in “The Micro User” magazine for the Acorn Archimedes or BBC computer. It was easy in those days to get an output from a computer, as these two computers had “User Ports” dedicated input / output ports brought out to a connector. Nowadays it is much more difficult to set a bit accurately timed as the operating system gets in the way. Therefore I decide to move the intelligence away from the controlling computer into an Arduino controller board and have the instrument driven from a MIDI signal that could be derived from computer, controller or instrument.

Nice, Philip Glass!