The game to get for your midi-converted cowbell!
Load COWBELL.LST in GFA Basic 3.5, press run.
Plug your midi-converted cowbell into the midi port, then bang on it as Bruce Dickinson (yes, the Bruce Dickinson) flies across the screen.
The aim of the game is to keep his fever down, and the only cure is: MORE COWBELL.
A piezo element, an arduino and a midi port. And some code that is long lost.