Availability of music can vary over time and between countries, depending on agreements between Spotify and rights holders, such as artists or record labels; therefore, content sometimes isn't available right away.
Spotify is constantly working to add new content to the platform so hopefully your favorite music will be up soon.
In the meantime, you can import local files to your Spotify library if you have this music as files on your computer.
Hope this helps. The Community will be happy to lend a hand if you need more help.
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