Music not being available due to licensing stuff isn't really a Spotify issue, sometimes (like the Garth example above) rightsholders won't play ball no matter

Music not being available due to licensing stuff isn't really a Spotify issue, sometimes (like the Garth example above) rightsholders won't play ball no matter what. And the original comment was clearly generalizing, no one is expecting literally every piece of music ever to be available on Spotify. So if we're going to be pedantic, you can add local files to Spotify on the desktop app and they will sync to your phone, so technically you still can listen whatever you want on Spotify.