I uncheck "Sync Music" and press Sync. It doesn't delete all the songs. Instead, it just does a quick sync and nothing changes. So now I have a full library on my iPhone 4s of 284 songs with 284 songs in iTunes, but yet Sync Music isn't checked. What's up with this? Is this a bug or something? Last time, I had to go in and remove every song one by one and I'm not doing that again this time. The ONLY thing I did this morning was delete a few songs from my iTunes library and tried to sync my iPhone again. It told me I had purchased items on my phone that wasn't in my library and if I wanted to transfer them, so I selected "Yes" assuming I didn't buy any of my songs through iTunes. After the sync, the songs I deleted from iTunes was still on my iPhone 4s. So that's when I tried to uncheck Sync Music, and the songs aren't deleting.