The overwhelming majority of music is not the work genius. It's work and involves craftsmanship, but it usually involves working within forms that is fairly well defined and providing small variations to those forms. For most listeners likable music has to sound somewhat familiar without sounding exactly like something else. Music has to sound like you expect it to sound and when it doesn't it's hard to engage with. AI should be really good at creating most music types and some of this generated music might actually sound "good". But just like most human created music, most it won't sound "good".
In the late 1990s computers started beating grand masters at chess. Somehow people still play chess.