Also: People (especially kids, students, etc) who want to make music but don't have the technical expertise to (yet?).

Obviously these tools don't do everything necessary to make great music, but the barrier of entry to making music is being lowered, and the quality floor is being raised -- and that'll result in a lot more would-be "musicians"[0] creating music that wouldn't otherwise exist[1].

[0] I leave the argument of whether these generative musicians count as "real" musicians to the Scotsmen in the audience.

[1] Bonus question: does art still hold value if no one sees it?