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Apple Media Services Terms and Conditions - Legal - Apple Media Services - Apple
- F. ” Purchased Content will generally remain available for you to download, redownload, or otherwise access from Apple. Though it is unlikely, subsequent to your purchase, Content may be removed from the Services and become unavailable for further download or access from Apple (for instance, because Apple loses its right from the Content provider to make it available). To ensure your ability to continue enjoying Content, we encourage you to download all purchased Content to a device in your possession and to back it up."
- H. ”You can see Content types available for Redownload in your Home Country at Availability of Apple Media Services - Apple Support . Content may not be available for Redownload if that Content is no longer offered on our Services.
Content also may be removed from our Services at any time (for instance, because Apple loses its right from the Content provider to make it available), after which it cannot be downloaded, redownloaded, or otherwise accessed from Apple. We encourage you to back up your Content regularly."
In that case I do not think you have any recourse. It is a decision by the artist. The best way to ensure this is not an issue in the future is to download and keep backups of any media you purchase.