How to transfer itunes music to iphone when itunes no longer works?

I have an Iphone 4 and I just updated it to ios 6. I have an older macbook with an older version of itunes and now my iphone will not work on my itunes unless I update the itunes. However, I can't update my itunes on my older macbook. I checked my phone and the past 50 songs that I purchased on itunes atomatically synced over to my phone. How can I sync the rest of my music to my phone when my itunes doesn't work with my phone anymore?

Download the newest itunes and it shoulf work… If it doesn't bring your phone and laptop to an apple store and have them help

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