Mostly stuff I bought from Bandcamp. It’s drm free, but for convenience I usually let it stream from the app.

I also have a bunch of mp3s from older purchases I listen to sometimes, but I don’t have a media server set up so that’s mostly limited to my desktop.

Sometimes I’ll pull up a specific track on YouTube, but that’s mostly for “do you remember this song?” stuff. Adblock and the “resume playback from lock screen” make it bearable.