Spotify works hard to have all the world's music and podcasts available to everyone. However, some tracks are currently unavailable depending on your country, etc. You can learn more about this here.
On another note, if you have music stored locally that you'd like to listen to using Spotify, I'd recommend checking out this Support article for more help.
Let me know if you have any questions 🙂
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Note: I'm not a Spotify employee.