brent
While I dual-booted with Windows I used to buy music through iTunes (they were the first online vendors to sell digital music where I live).
I have a paid subscription to Deezer (a European streaming service similar to Spotify), but since streaming royalties are so low, especially for the smaller, more independent artists, I buy their albums on Bandcamp - preferably on Bandcamp Fridays, but not always.
Last but not least, being a Kristin Hersh (Throwing Muses, 50ft Wave) fan, I've signed up to support her a couple of years ago (she was the second musician to sell music online after David Bowie, and has a Patreon-like subscription service called "Strange Angels", which predates Patreon by quite a few years).