- Do you agree that from experience and observation, we can tell that certain genres or fields appear to become completed?
- Does this concept or another concept best explain what is happening?
Right, that's a good point you're making about most points in song-space being worthless, and it maybe even shows that the multidimensional-space way of looking at things isn't really appropriate in this situation. Since I can't think of anything better, though, we might as well just keep talking about a "sparsely populated" space.
I think that distinction comes to core of the problem here: we're talking about a hugely vast space, where a hugely vast proportion of points in it are inconsequential. There's a battle going on between those intuitions of "hugeness;" for me, the space wins out, for you, the sparseness. It's probably not possible to reconcile these intuitions easily, as they're not immediately based on anything concrete. As unfortunate as the phrase is, I guess we'll just have to agree to disagree (unless I'm totally wrong here, which is a possibility). For what it's worth, I'm less confident now in my opinion that music genres like "classical" and jazz aren't close to being filled up.
You're making a bit of a different point in this comment, though, which I think it's important to clarify. It seems to me to be far more likely that a specific genre that has existed for decades or centuries is filling up, than that music as a whole is anywhere close to completion. The two are very different claims.
You mention rap and electronica as being some of the "final genres" to be substantially completed, but think of where they came from, and why they are the most recent genres. Rap (or hip-hop, not really sure which is the more accurate term for what I'm talking about) came out of a period of profound social change, while electronica is only possible due to technological advances in the last 30 or so years. I don't think anyone would have been able to predict Skrillex, or anything like it, in the '60s or maybe even the '70s (though I'm unconfident about exactly when because my history is lacking).
Doesn't this suggest that it's most prudent to "expect the unexpected" when it comes to musical progress? I only gave a couple of examples, but I'm sure that more exist; generally, it seems like the emergence of new genres of music is a much less predictable process than the creation of songs within a given genre. You'd need quite convincing evidence to suggest that this time is different (barring some kind of civilizational collapse or "end of history"-style cultural equilibrium, of course).
Even though we are of slightly different opinions, I'm glad we are on the same page of what I was trying to discuss and get thoughts on--this has been good. You're right that the sparseness I'm proposing is hard to judge and you can't break down the argument further. My perception comes from my experience in attempting songwriting in the genre of rock where I felt like after spending many hours songwriting that I could understand and perceive the boundaries of the genre/niche at an intuitive level from much trial-and-error--which isn't an argument to convi...