ITunes songs won't sync to iPhone?

I download all my music from mp3skull.com. All of a sudden all my music won't sync to my iPhone, I tried restoring my phone because that worked to fix the problem a few weeks ago, but it didn't work this time. I click sync and the 'audio' portion of the bar at the bottom fills up, and then in seconds it says its finished syncing and none of my music is on there. When I click "on my iPhone" it has all the music listed but with the grey dotted circle next to it. How do I fix this?!

That's terrible

You may refer to this tutorial, it's about how to fix iTunes sync problem with iPod/iPhone.
http://www.mac-dvd.com/how-to-fix-itunes-sync-problem-with-iphone-ipod-ipad.html

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