So I just updated last night both my iPad (64 GB wifi+cell) and iPhone 6+ (64 GB) to iOS 8.4 and then this morning discovered all of my music on these devices is gone; over 2500 songs. I synced my iPad to my home iMac iTunes this morning and it reloaded my library of songs - also gave a strange warning that it was overcapacity (14 GB) as it was syncing, although as I checked the actual iPad "about" setting which indicated 17 GB was available. Once it completed the sync iTunes showed the iPad having 17 GB available. i was a bit fearful of connecting my music emptied iPad to my desktop iMac, and prayed that the syncing operations in iTunes wouldn't erase my iMac music library instead of copying it to the iPad - the "overcapacity" warning did cause my heart to skip a beat or two. Well I'm at work now and just checked my iPhone, and all the music on it is gone too. I will try syncing tonight at home. This is a royal pain, and I read no warning about this issue. Also it seems like Apple Music on my iPhone was showing some of my library (purchased in iTunes?) when I was initially connected to the Cloud. When I disconnected from my Apple Id account they disappeared. I don't like or use iCloud - I live in an area where my cable internet connection is not all that reliable and has issues weekly, I also travel a lot and cannot always get free wifi. I was out of the country last month vacating on a tropical island with no wifi and no access to the cloud - relaxed on the beach and listened to my music because it was on my iPhone. So I prefer to have everything locally on my devices. Shouldn't Apple have given better descriptions of what was going to happen with this update? No previous updates have wiped out the music library on my devices.