Why can't I get music into my iphone 4?

So i recently got a new computer and i haven't tried syncing music into my phone until now and it doesn't allow any music into my phone when i drag the item to my phone. I still have enough storage in my phone and the itunes is updated so it has to be my phone but i don't know what it is. Any suggestions?

Have you the right software installed on your new computer? The iphone should ask you whether you want to install it when you plug it in to your computer.

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