My iTunes won't sync certain albums?

I have the latest version of iOS 7 on my phone, and I have the latest version of iTunes itself. Some of my new albums that I've downloaded (not from the iTunes store) are not syncing to my phone. This is the first issue that I've had with syncing music that I've downloaded elsewhere. Does anyone know what's happening? I've also restarted both my iPhone and computer.

Are the albums actually in your ituens library? If they are and you list them by song are they greyed out or have an "!" or "?" next to them. That tells me itunes does not recognise them or itunes can't locate the files.

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