Not OP, but domain blocking doesn't seem to be working at the moment (at least for me). I ended up searching "nsfw" in magazines and blocking from there individually. That method seems to work, but it's also kind of a never-ending process, as other NSFW magazines start showing up as people sub to them. I'm sure it'll get sorted eventually.

I agree with both of you. I'm very fond of everything by them up through the American Gothic EP, but Mellon Collie is still kinda the peak.

This looks great!

[...] There are also instances with varying levels of moderation, which may be encompassed in this.

I know you didn't really touch on what the moderation aspect might involve (and maybe you have provisions for this in a section I skimmed), but ideally I would want defederation lists to be included somehow, at least as an advanced option. Does the user want/not want an instance federated with [other instance]? And then, before final instance selection, present the full list just for verification.

An obvious one: Third Eye Blind - Semi-Charmed Life

Couldn't decide, so here's two.
Finch - What It Is to Burn
TOOL - Ænema

Sparklehorse & Danger Mouse - Little Girl (ft. Julian Casablancas)

Bear's Den - Pompeii
This version, specifically.

And another excellent song from the same album: Smashing Pumpkins - Thirty-Three

The War on Drugs - Suffering

Actually found this harder than expected--most of the songs I associate with summer are the wrong genre, or became super mainstream. But I played this album extensively one summer, and this song in particular has that warm, stuffy evening vibe for me.

It's on youtube in full (with subs, legitly, from Tencent) if you want to keep watching it: https://www.youtube.com/playlist?list=PLMX26aiIvX5rFSYPXtcqda3tWd6pGVD5Q

Oh absolutely. Adore was actually the album that got me into them.

Zwan - Ride a Black Swan
https://www.youtube.com/watch?v=rZ7550OtqPQ

Jack Off Jill - Angels Fuck
Very dramatic, but extremely cathartic at the time.

Deftones-y. I like it!

Deftones - Cherry Waves

Angus & Julia Stone - On the Road