Will Harvey's Music Construction Set

The Good
Aah, a classic :-) One of the first programs I had on the good ole' XT (and still do, by the way), this thing amazed me - how the hell does it produce multiple sound channels on the measly PC speaker, through which I only knew how to play tunes using GWBASIC's PLAY statement? I had several example tunes for this program, most of which simply delighted me as I just sat there listening to them for hours. I even printed out a few tunes to play on an my old synth.

The Bad
What's not to like? It's not really an "educational" piece and it does it job really well.

The Bottom Line
Hell, if you appreciate old software, you'll love this one.