If you want to listen to a certain track in Spotify and it's not available, you can download it and listen to it as a local file in Spotify. You can learn more about how to stream local files from Spotify here.
Hope this helps! Make sure to ask any other questions, I'll be happy to help.
Cheers, Jose 🙂
Help others find this answer and click "Accept as Solution".
If you appreciate my answer, maybe give me a Like.