Okay, so I updated to iOS 6 on my 4S. Was trying to get my contacts to sync from the phone to google calendar, and during a sync, all my music vanished from my phone. I went to resync it, and it seemed to be going fine. I have it set to "Sync only checked songs and videos" and was looking at iTunes, which said it had 10GB of music. Exhibit A "That must be wrong," I thought, as before I lost the music, I had around 16GB of music. iTunes refuses to sync this ~6GB, for no apparent reason. I hit sync and it doesn't send any music, or show an error message. If I uncheck "Sync Music" but hit "Cancel" on the pop-up, the gauge shows that 16GB of music is going to be on the phone. Exhibit B Until I try to sync, which drops it back down to 10GB. I can't figure out a way to do this. If anybody can help me, that would be great. If you need help understanding, let me know. It's kind of hard to write about it.