It would take a long time for one person to make PGM-created music (melodies, variations, chord progressions, rhythms, ABACA-type forms, etc) decent enough to b

It would take a long time for one person to make PGM-created music (melodies, variations, chord progressions, rhythms, ABACA-type forms, etc) decent enough to be sort of satisfying. I'd bet that in that same time or less, you could learn to improvise equally decent stuff - probably far better - yourself on at least two instruments. If you've been listening to music for 5-10 years, you'll probably never 'train' a machine to know what music is as well as you've been trained. Whichever way you go, if the product can't compete with the flood of stuff that's already out there? including production quality? I can guarantee you what people's reaction will be. Not pretty.