Having problems with music on my iPhone 6S 128gb. I have just over 7,000 tunes on iTunes on my MBP, many have been uploaded thru cd's and collected over years and years. Since I have purchased my iPhone 6S, when I go to transfer/sync music from the MBP to the iPhone about 3,500 songs are greyed out with a circle to the far left. They transfer onto my iPhone, but as I don't want to use my data to stream music, I have the music turned off through the mobile setting in settings, so I get an error msg pop up when I click on the greyed out music on my iPhone, telling me to go to setting and basically allow the music app to use my data - I don't want this! I can listen to all my music on my MBP "offline" but its a different story on my 6S. I never had this problem on my 6, its only been since I have changed phones. A lot of my music was also downloaded for "offline use" thru Apple music, and now they are also all greyed out, and I need to download all of them again for offline use.. iTunes & iPhone 6S are running the latest versions. Anyone know what is going on? Cant seem to find a fix at all and is quite frustrating as I am missing half of my music on the 6S. Any help would be awesome, cheers.