IPhone – Apple Music tracks that are added on iTunes aren’t showing up on iOS devices

I had the exact same problem with my iphone and itunes account. I would remove the manually added songs but whenever I synced they magically re-appeared. It took me some time but I figured it out eventually. If you go to your itunes library and untick the unwanted albums/tracks and THEN remove the manually added songs and hit apply, all the unwanted songs are removed from the device.

I had this exact same problem and found the answer I was looking for within one of the Apple communities. Simply go into iTunes store and scroll right to the very bottom. There amongst the small print you'll see an option for purchased. Click on there and you will see a list of all songs/albums and you can choose to either download all or individual tracks. Once downloaded they appear in your library as normal. Don't ask me why they don't appear straight away, but this resolves the problem of those not transferring when syncing