Thats interesting
If you ever manage to get the program off the tape I'd love to see it.
I've done some experiments in the past generating random melodies and transposing or reversing sections that were ... interesting! I wouldn't say they were great.
I have tried to little avail to get my laptop to play notes through the midi synthesiser on the sound card from Python, but despite it being proclaimed easy I can't get a peep from it. I also used to have a program called "Band in a box" that you could type chord progressions into and it wpuld synthesise an accompaniment and drums which isn't quite what I wanted but fun to play with.
I will probably end up getting one of my old Atari 7800XLs or my C64 to work and try again using that - at least from BASIC you could get notes to come out!
But I still would like to find that article because if it was SC/MP based I have a number of "spare" SC/MP chips just looking for a use!