Your humble editor has encountered this herself, kittens. ALLLLL my imported Elvis Costello, gone. All the mp3’s that pre-dated iTunes, gone. Everything Apple didn’t recognize, gone. At least with this Apple Music function, Apple steals it and you can play it back if they allow you. So, great. With the iTunes synch that I did, those files were simply eliminated, as if they had never existed. Which, of course, made me hunt through the internet to dowload new copies of those old files, where they still existed (which not all of them did). I’ve said it before and I will say it again: iTunes is the only actively malicious software Steve Jobs ever released. Don’t use it.