Content available on Spotify and other streaming services is managed by the artists and labels. Sometimes there are changes in licensing, distribution or other aspects, sometimes agreements are not reached, other times there are regional restriction.
All of which may lead to greyed out or unavailable content.
The content may reappear again. If you wish to know what's going on, I suggest contacting the artist to ask about it. 🙂
Have a nice day!
SebastyRock Star 18
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