Why won't't songs sync to my iphone 4s?

My iphone and itunes have up to date software and this past time when I synced my phone some songs that were already on my phone now skip and show the still downloading circle and songs from my new CD won't upload to my phone at all. I've tried restarting the phone, deleting/readding songs, etc and nothing has worked.

ITunes is a pain in the **** isn't it? The amount of times I've had trouble with syncing music onto my phone is unbelievable.
You said you've tried deleting the songs and readding them but did you delete them from your iPhone or iTunes?
What you need to do is delete the songs from your iTunes library and drag the songs in again and then sync.

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