My partner and myself both have the iPhone 4 and are both using the one iTunes ID to buy apps and music. Since iOS 5, my partner didn't read the instructions right to install ICloud and ended up using mine which we finally got solved. But it has meant that he has been unable to sync music from our library to his IPhone and he keeps getting the message that he isn't synced to that library which he is. I'm slowly losing the will to live as he useless when it comes to these things and I don't want to erase his phone and restore. Is there anyway to just put the music back on? Thanks in advance