iTunes
I've noticed that music disappears from my iTunes Library. I download my entire CD collection into iTunes and I notice that entire albums vanish without a trace. I no longer have many of the CDs I used to create my library; and some aren't even available in the iTunes store, so for many of these rare items are lost forever. Why does this happen? Also why are some of my artist and songs re-categorized? I spent a lot of time organizing my library and I don't know how things get moved around as I have chosen to manually organize my library. Can anyone tell me why this happens?
Mac mini, macOS 10.13