Avenged Sevenfold for Prog Metal

If there's one really good site to crawl, it's Musicbrainz. From my experience they're the most accurate and well-constructed music database that actually has good moderation. Although I know you don't like musicbrainz because you find it too complex to use. Honestly, none of the major metal databases are "crawl-worthy" in my opinion. For some reason, metalheads seem to not be very professional at running websites, and aren't exactly friendly enough to hold engaging dialogue. I suppose Metal Kingdom is the best of the bunch, but a huge chunk of that site is in Korean, and I STILL wouldn't call them totally accurate. The MMA is just not popular enough, which is a shame because it'd be the best if it had a larger user-base. Nevertheless, I'm just not a fan of the autobots to begin with; as you stated they're too noisy and I don't like how they can rate albums, which just echoes the consensus of a different community outside TYM (and RYM has notoriously bad taste). Imagine if another site decided to crawl TYM and their TYMbot rated albums, which used ratings from the TYM autobots. Remember in the other post how I stated that AI will begin to "inbreed?" Well here it is in hypothetical action.

Well metacritic is a ratings aggregator, not a music database nor encyclopedia, so they're not as concerned with the pedantic aspect of things like genre arbitration. Allmusic does the same thing, but this is just do to limitations on the site. I meant they're the bottom of the barrel for sites that actually arbitrate genres. Bad to be fair, metal music is a form of popular music, and thus could theoretically fall under pop/rock if the limitations requires it to. The same goes for "Post-punk," which is also a form of popular music. It's not as much of a stretch as say calling Avatar nu metal which is just plain false. The problem with the MA is that their admins are, for lack of polite terms, stuck up, elitist morons who put their own ego ahead of accuracy. I think you're better off taking all metal bands "pop/rock," which isn't really too much of a stretch, if you view "pop/rock" as "popular music," in general, then misclassifying bands with incorrect subgenres because your head is so far up your ass you can't see right. In other words, precision (the subgenres themselves) isn't as important in my opinion as accuracy (the proper genres and subgenres). Sure, Allmusic lacks precision, but at least it's accurate.

I don't know how records stores in Sweden work, but I suppose since metal is considerably more mainstream there than it is in the United States and Israel, it may not be problematic to consider it "pop/rock." Every record store I've visited in the US and Israel have a "Pop" section, and either a "Metal" section, a "Rock" section, and a "Punk" section, or a traditional "Rock" section, an "Alternative and Punk Rock" section and a "Hardcore Punk and Metal" section, as well as other relevant genres classifications. And in the case of my local store in the Pennsylvania, they have a" Death Metal," which they just use for all extreme metal (such as black metal, too).

Yes MB is completely open source, free, and non-profit. That is what makes it so great. I've been using the site for years, and I genuinely find it to be the highest caliber in almost every regard. I don't really know what you mean by "noise." What do you mean by "not proper releases?" A music database should archive everything an artist has released - it seems pointless to pick and choose certain releases for archival. The point of Musicbrainz is to get accurate information in the releases so you can tag them in your personal music library. RYM is a larger music database then Musicbrainz, so I can't imagine you getting fewer "irrelevant" releases from there. This is also why I'm not a huge fan of the autotagger bots, unless you want a comprehensive archival of an artist's discography, as tagged per other people's opinions.

MusicBrainz, is accurate, and if anything, is TOO precise. You're able to tag any releases with anything you want. Oriental Metal, for instance, is not an accepted genre tag on the site, but I can still tag a release as such, and it would fall under other tags. If you click any tag on any release, it'll give you a comprehensive list of all other releases that share that same tag. For instance, here's the album "Folium Limina" by The Otolith. At the present moment, I'm the only one who's rated the album and assigned tags to it. If also added the CD version to the release page and uploaded the album art (and since it was within the last few days, it's highlighted right now): https://musicbrainz.org/release-group/2e4e764d-2528-485c-828b-df3f695f6855

You can see here the strengths and weaknesses of this system in which all tags are accepted. Users can vote on tags, and if a tag reaches 0, it will not longer be visible nor show up on the list with all the items with that tag. For instance, the tag "Chamber Doom" is pretty much a term I invented and am using to describe the album. I have only used it on this album, thus far, which is why it is the only album tagged with it, however there are other artists I think belong in this category, such as IVAN from Australia (which I haven't tagged as such yet because I don't have anything from him yet in my collection). Symphonic Metal is also rather contentious, since it's a far deviation from symphonic metal in general, but I've seen other people describe this album as such. So if someone disagrees with this tag, then they could simply downvote it and it would disappear. But if someone else upvotes it again, it will reappear.

For descriptor tags, such as musical attributes and location, which all go under other tags, as well, I always tag the artist, rather than the album, as such... I don't know I started it like that, but I did. You can view everything I tagged The Otolith as here: https://musicbrainz.org/artist/b13eb082-4d15-4ec0-a944-04543c678a2d

Another limitation is that some descriptors, like "orchestral" are considered genres, so I couldn't tag this album with orchestral, which is good descriptor, but since it's not the orchestral genre, it wouldn't make sense.

If you click "see all tags," and then "show all tags" you'll see that someone else voted Stoner Metal, which I downvoted and is now 0, hence why it doesn't show up on the main page.

There are a lot of irrelevant tags tags such as "pop/rock" on a lot of metal artists, but that's just what happens when normies are given access to use any yags that they want. I still find MB to be better than Discogs in tagging, as I often disagree with Discogs, but not as much on Music Brainz. Honestly, MB was pretty much invented for this purpose of crawling and tag completion. It's a match made in heaven for TYM, in my opinion. Hence why they have API. It's a shame that so free people use it, but that's also what makes it so good (it's very lowkey and chill there - notice a pattern with my feelings towards larger vs. smaller sites? - as you stated the larger sites are tyrannical). It's definitely better for older releases, but some of the more popular modern acts on the site are still tagged  

When crawling, you're better off gathering information from the "release groups" rather than the the "releases" themselves, as this would give more precise information for the taggers. There's a learning curve, but it's so worth it. If I were to create my own RYM-clone, I'd use Musicbrainz as my baseline database from which to draw information.