Just signed up to give one of my favourite musicians (Toby Driver) about 8 bucks a month and in return get access to their archive and a ton of unreleased stuff, films, bsides etc that were previously unreleased.
Not something I could do for lots of artists, but would consider doing it for a couple where I loved them enough and there was a good amount of content.
I do a patreon thing for Adam Gnade, but that is more his writing than music atm.