How would I connect my iphone to my surround sound?

So I have a Sony blu ray 3d system and it has a USB port in the front. And I could of sworn that one night my friend was playing his iphone music through the port. Although I can't figure it out.

Did you try this? Http://www.alternativewireless.com/iphone-5-usb-data-cable.html?___store=default

if not iphone 5 try this, http://www.acetag.com/apple-iphone-4-iphone-4s-long-blue-usb-data-cable.html

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