Back in the day before Spotify existed you could use different options. You could use Discogs to find similar music. Then you could use SoulSeek to find this m

Back in the day before Spotify existed you could use different options. You could use Discogs to find similar music. Then you could use SoulSeek to find this music. Or simply join a metal channel/server on SoulSeek or IRC or DCPP and find other fans of similar music. But even before that you could also just look at a label catalog and travel to a vinyl or CD store (where you can listen before you buy...). Or you could use shortwave radio to catch a pirate station. Yes, this even worked for obscure genres like the one you mentioned. I have a broad taste of music and at times I've been into subgenres of the genre you mentioned. Have I discovered new music via Spotify? For sure. Did different methods exist before? Yup. Is the Spotify method high signal to noise? Nah, the previously mentioned methods also worked very well. And I have virtually and IRL met tons of people, including people within the core of music subgenres. Thanks to Discogs, DCPP, and SoulSeek. I do like one feature about Spotify showing shows near me (even though I have passed the age / time of my life where I went to artists as I have only time and money to do things like go to theatre with my kids). However that feature as well as buying merchandise also existed outside of Spotify long ago.