Q: my music library on my mac which is comprised of loaded cds won't transfer to my iphone6

Hi,

We need more information. Do you have iTunes match or Apple music? How are you trying to sync?

Jim

https://discussions.apple.com/thread/7163823 - If you have signed up for Apple Music or iTunes Match you won't have the option to manually manage or sync music to a device in iTunes. Music syncing is done through iCloud and all your eligible music should appear there. Movies can still be synced.

A bit more about this, and some options- https://discussions.apple.com/thread/7194995 and: Move content from iTunes on your computer to your iPhone, iPad, or iPod touch

- https://support.apple.com/en-us/HT201593

and a workaround - https://discussions.apple.com/message/28842873#28842873

If you have not signed up for one of the iCloud based services:

https://discussions.apple.com/message/28481661#28481661 - "Music syncing has changed in iTunes 12.2.0 and iOS 8.4 Music App."