My iphone 5 won't sync new music?

My itunes and iphone have updated software, and it always synced my music without a problem in the past. But now i downloaded alot of music into my itunes library and when i plugged my phone in to sync, the music wouldnt download onto my phone. I don't know what to do.

I don't know why iPod and iPhone users insist on "syncing" music - it's not like you can't use manual management on the iPhone 5 (I have), or that syncing causes all sorts of problems. I've been dragging and dropping my songs on a manually managed iPod Touch for nearly 3 years, and there's never been a real problem putting on it every song I wanted.

But, if you want to keep using sync, go right ahead.

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