Purchased music suddenly missing from my library
Days ago, I signed up for a free Apple Music trial subscription. Today I saw that many, many albums and songs I purchased over the years are suddenly missing from my library on all devices. Playlists, including my mammoth playlist of Christmas music, compiled over several years, are skeletal. What is going on, and how do I get Apple to give the music I paid for back to me? I have canceled the trial subscription in disgust since noting my music missing.
iPad Air, iOS 12