>But what gives me joy with art is that it's a communication from one person to another
Maybe if a person generated 50,000 songs, not even listening to them, you could have a point. Although, even in that case, regardless of the lack of an "artist's intention," there is the interpretation of what people will take from that thing. And that interpretation is often different from what the author originally had in mind. Hell, most people don't know the author of most movies, TV shows, and the like they watched. In other words, to me, it's more about what people take from that thing, as opposed to "Oh, what that sentient being was trying to communicate?"
And I do believe a sufficiently advanced AI model would be able to mimic or synthesize human knowledge/worries/dramas in such a profound way that, regardless of "intention to communicate," it would be able to create things that people would relate to and take deeper meaning from.
Also: the very dataset where that thing was trained wasn't trained on an alien dataset, with an alien culture and the like, all originating from poems written by real people, movies by real people, etc., etc. The model learned from human culture; therefore, whatever it produces is a reflection of that culture, which people could and most likely will relate to, and, hell, they are already doing that.
But even taking the argument at face value, "Oh, human creation," someone might have used AI, but they were still involved in all parts of the creation process, like writing the lyrics, curating the data, and the very fact of them choosing a song and saying, "Hey, I liked that, I will share it with people," would already be a communication.