Music won't go back onto IPhone after iOS 6 update?

Please help! So I have an IPhone 3gs and I just updated iOS 6. My music is still on my itunes in my laptop, but when I go to my iphone tab it says there's no data, and it won't let me hit the sync button and it's not telling me why. I tried restarting my computer and that didn't work. I hit restore but I'm afraid to do it since it says it will erase everything on your phone.

You have to update and restore it with the computer. Everything's gonna get erased if you want your music.

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