redownload of historical purchases
How could I redownload the entire music library to my devices (iMac and iPhone XS).
iMac Line (2012 and Later)
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If the purchases are still in the store, and if you haven't moved countries : Redownload apps, music, movies, TV shows, and books from the App Store, iTunes Store, and Apple Books - Apple Support
And check to see if you've hidden any : Hide and unhide music, movies, TV shows, audiobooks, and books - Apple Support