Ok so here is the deal. I will try to include relevent info. I have a PC. I have an iphone4 NOT jailbroken. I have had itunes for several years. I have 12.2gb of music on the itunes on my computer. I have been trying to sync that music onto my iphone. I have tried using the option to copy all music..and I have tried manually manage music...and I have tried sync only checked music and checked it all. The end result is the same. My iphone syncs and then shows only 4-5gb of music. My movies sync fine, and my podcasts sync fine. However some music just does not sync to my phone! Example is I have Led Zepplin album on itunes...it used to be on phone too. Now its on itunes but will not sync to the phone. I indeed DO have extra space on the phone...this does not seem to be about space on the phone. I do not get any error messages, it just doesnt happen. I have done a thread search here but have not seen anything to date that addresses my particular problem. Can anyone help me out with some advice?