Just to let you know, Please note that for Spotify to have music on their servers; they require the permissions from the record label. The chances are that the record label have removed the permissions to Spotify for that album, which means that Spotify can't keep the music anymore. It could be just to fix metadata, at which point (if it is the case) it should appear very soon. Spotify make everything they have available to us, so hopefully it will appear again soon!
You can also check out the Music FAQ which has some more information.
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