Based on a Csound “voice” programmed by Canadian composer, programmer, and educator Jean Piché, professor at L’Université de Montréal, some years back. My post from 03/23/15 has the gorier details.
The audio file below uses random seed values calculated in Excel and pasted into each invocation of the voice instrument. Some of the harmonies are quite nice, although that’s purely coincidental. Some of them — technically speaking — really suck. And a few sound like hormonal tomcats fighting under the front porch. Such is the nature of random seeds. The final nine minutes or so consist of sequences of four-part harmonizing that start fresh every 35 seconds.
Download incantation 5 (13:45, 8.3 MB)
Here, for comparison, is the file I uploaded on 03/23/15, which used far fewer random seed values. (I mostly just plugged in whole tenths from 0.2 through 0.9 arbitrarily.) My impression is that it sounds generally “prettier.”
Download incantation 4 (04:47, 2.9 MB
Joseph Ervin Jr: Synthesizer Fan 