You can use SoundCloud, SoundClick, a lot of artists have set up MP3 downloads for their music there, Bandcamp, as another user mentioned, and also archive.org.

You can use SoundCloud, SoundClick, a lot of artists have set up MP3 downloads for their music there, Bandcamp, as another user mentioned, and also archive.org. There's also yt-dlp, but I'm less keen on that because it doesn't do the ID3 tagging.