I was so looking forward to try Apple music until I started to read all those horror stories. Before I start my trial, I have a few questions. I have my collection of music that built from more than 10 years ago. I spent thousands of hours to rate and tag them all the way I want. The last thing I want is to lose my collection. First, if I don't enable iCloud music lib, what am I giving up? Can I still add music to my local lib like before? Secondly if I enable iCloud music lib, would it removed my local files to replace it with iCloud versions? Is there a way to prevent it?