Now, what have I heard that music in and should I tell anyone about it? :)
In a (very tenuous) way perhaps Commodore pioneered this process - the A500 motherboard had 'B52/ROCK LOBSTER' written on it in large friendly letters. No actual notation, though. Subsequent ones had JUNE BUG, CHANNEL Z, etc, IIRC.
Ah, my good friend Google found [link|http://amiga.emugaming.com/b52board.html|this].