Experimental Industrial / Noise.
In my youth, my father would come into my room and would ask where that noise came from, and he flat out refused to believe me when I said that was music.
One example would be Parca Pace - Topic.
Download also has a lot of tracks that my father would not recognize as music, like The Eyes of Stanley Pain.
Of course, if you are reading this, then none of this might be particularly niche to you.
Perc, not sure if they are well known
Psychedelic Trance. Infected Mushroom is my goto. Astrix is another incredible one.
Infected mushroom is insane, insane.
Celtic Rock. Enter the Haggis is my favorite artist (and for other Canucks, they’re from Toronto). If you’re curious, try listening to one of their instrumentals.
Jazz metal, maybe. I don’t know, though. A lot of my stuff is categorized as “jazz”, “fusion”, or “chamber music” because those are catch-alls for “I have no idea what the hell this is”.
One of my favorites is Witch House. Discovered the genre on accident one stoned night when I let YouTube autoplay take control for a few hours. Discovered some dope artists like Sidewalks and Skeletons, SALEM, Black Ceiling, Fraunhofer Diffraction, White Ring, and others with some witch house overlap like Crystal Castles, Purity Ring, etc…
Maidcore. It’s (usually) instrumental metal, but the artists go by names like [blank] The Maid. Yakui The Maid, Chikoi The Maid, Ozoi The Maid…
Yakui The Maid - In Affliction
I’m recently stuck on maidcore. My favorite Yakui album is the one they supposedly hated, the chiptune one that comes up when you search their name. I describe it as the music in my head.
Is it niche if it’s just… Old and not made anymore?
The vast majority of songs I like are specifically 90’s grunge.
death metal, black metal, all subgenres of both- the only thing I listen to
Probably New York No Wave insofar as everything I mention the genre the immediate response is “Oh, like the B-52s?”