I used to use torrents for situations like this, but now I’m not sure if they still work well or what the options are. Maybe there are other sites I don’t know about.

Well, don’t say that. I’m not exactly a huge music fan who needs a new dose of music every day, but even on Spotify, sometimes I really can’t find what I want to listen to. But it’s on YouTube. My solution is the tubidy mp3 service. I just download music from YouTube and convert it right away. It’s convenient and free. You can do the same with podcasts, lectures, etc.