I plugged my iPhone 6 128GB phone into my macbook pro 13 to add some music via iTunes. The music will not add for some reason. , also what's even stranger is now I'm missing tons of music from my phone. It shows that I have like 1,000 songs on the "about" info on the phone itself, but when I plug into the phone and look at it under iTunes all my music still shows to be on there like 6k plus songs, so it's acting as if it's there in Itunes but not on my phone. What is going on? what can I do to fix this?