Besides, a LOT of the music people listen to is already heavily computer generated.
source?
People have been "producing" music using computer assited software for decades. I know people who have produced whole albums without ever touching an instrument and who know nothing about musical theory, the product? Pretty good.
Music production software can correct melodies, autotune voices,setup chord progressions, lay down rhythms etc. You could probably argue that knowing advanced musical theory hasn't really been important for a long time because so many people love "simple" music. Pop, dance etc.
This combined with the already practically endless amount of good already available practically makes the need for machine generated music redundant, the automation of musicians, photographers and painters happened a long time ago.
I think music is largely about "discovery" now, there is just such an abundance of great stuff already available, you could never hear it all in a lifetime.
But hey, people still manage to make great stuff and live music is still the life blood of it all ;)
Algorithmic composition, on the other hand, is less common, and mostly relegated to avant-garde or art music, although there are examples in popular music such as Brian Eno[2].
[1] http://www.image-line.com/support/FLHelp/html/pianoroll.htm
However let's not forget that we have (and we have had for some time now) algorithmic composition[1] and more recently we have seen style transfer through neural networks[2] and if artificial intelligence is able to produce visual art and music, that makes me think that there are very few human activities that may not be automated.
What will "save" some human activities is either technological shortcomings, which are probably temporary (e.g. the hand made cigars in your humidor: the difficulty is that machines are currently not very good at rolling cigars with a whole leaf filler, but I think eventually we will get there) or consumer's preference, which is arbitrary (e.g. you may think "OK so now, in 2025, machines are able to roll as well as the best Cuban rollers, but I choose to buy only human made cigars, just because I can").
[1] https://en.wikipedia.org/wiki/Algorithmic_composition
[2] https://research.googleblog.com/2016/10/supercharging-style-...