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Availability of music can vary over time and between countries according to licensing agreements between Spotify and rights holders, such as artists and record labels.
Spotify adds new content every day, so if you can’t find something that you’re looking for right now, it may appear (or reappear) soon. In the meantime, you can import local files to your Spotify library if you have this music as files on your computer.
Let me know if you have any other questions, and have a good day!
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