Hey Moogzoid, welcome to the Community!
Missing or unavailable music is almost always a decision by the artist or record label to withhold the content from Spotify. Sometimes it's temporarily unavailable while they sort out legal issues or correct metadata, in which case the music be available as soon as they resubmit it to Spotify. You can try contacting the artist or label yourself to ask about availability, or you can also fill out this form to let the Spotify staff know of your interest.
Have a fantastic day!
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