Why will my iphone not connect to itunes?

I have an iphone 4s and i want to put music from a new cd that i got onto my phone through itunes. I have tried to connect it to my laptop and it connects as in it starts to charge but i doesn't show up in the devices on itunes!

Have you authorized the PC and the phone with itunes?
Try resetting the phone and removing all temporary files and cookies from your PC/Laptop and try again.

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