Very little, nowadays, but most stuff from Eric Ravn (metal/rock, somewhat famous for Wuthering Heights) [0] is not even available to buy other than as CDs that you order via HTML form ;) A few years ago, German medieval/folk band Die Streuner also wasn’t available on streaming services. Both have in common, that they have their own label.
Ha, die Streuner were the original inspiration for me to write my own dumb and small music streaming service. Seeing them mentioned here might just give me the motivation to pick that project up again.
Hah, that’s cool :D They are on Spotify, nowadays, though. But yeah, I own all their albums, though it took until last week for me to realize they had a 25th anniversary album in 2019. Without facebook it’s hard keeping up with releases of bands not on Bandcamp.
[0]: https://nagelfestmusic.com/shop/