Yes, some such questions are just link-only questions, but quite a lot of them go into substantial discussion about genre elements not tied to any specific song.
This is exactly why they are lumped in with all the others. No one was trying to fix the quality of the questions/answers and now we have to take a bit more extreme of an action. Even if some answers were general, people searching for them would not be likely to find them unless they were asking about the same song/artist. It does not make sense to allow them over the other questions when they have the exact same problems.
They even have a unique problem to them which is most genres especially niche sub genres don't have very good definitions nor does every artist/song fit cleanly into a single category. Because of this identification itself can be more loaded and subjective than just answering what typically makes up a genre.
There's a really simple solution here that instead of allowing questions that ask us to identify the genres of a song/artis, we instead focus on questions that go into detail about what goes into defining that genre.
- It is more searchable in the long run as people are less likely to search for the genre of a specific song
- Even if there is a debate about specifics of a genre, it would benefit in the Q&A format to have the competing views of the genre
Doing this should be the best of both worlds where we eliminate the low quality, hard to search, link only questions and focus more on the content we can provide that makes sense for the OP and future users of the site.