Help itunes keeps freezing

Just over the last 2 weeks my itunes keeps freezing. I was listening to itunes radio, did not download anything, and did not update it the last time it worked. I do do all the updates. When I open itunes it opens up and then as soon as I try to select anything or try to close it I get the spinning beach ball of death.

I tried uninstalling the app and then reinstalling and no luck with that either. Same result. Can anyone suggest anything? I just got an iphone and I am dying to trow my music on it.

TIA.
Steve

PS It is on my imac 3.06 4gb of ram and 500gb hard drive that is about 40% full. Itunes works perfectly on my MBP.