By 'unknown', I mean music genres that have a rather small listening base compared to others. I'll give some examples- my favorite 'unknown' music genres are lofi-hip hop, vaporwave, and synthwave. I suppose a good indicator of whether or not it's unknown is if you search up a specific song on Youtube, and it only has a few thousand views. So what's yours?
I'm also a big fan of Electro Swing and Synthwave, and Lo-Fi hip-hop/Chillhop as well (in fact it's one of the only types of hip hop I like, the others being trip-hop and some instrumental trap). I'm a big fan of stoner/doom metal, and I guess it's pretty unknown outside the metal community. I only discovered it about 2 months ago, and it's already one of my favourite metal genres. I love the heaviness of it. I'm also a fan of symphonic Death and Black metal, but I don't know if they are unknown per se.