How to play music from my iPhone to my AV receiver?

Just want to play music from my iPhone 4S (not iTunes) connecting it to my Denon AVR 2312 Receiver and listening to the music with my home cinema speakers. How do I do this please?

Added (1). Yes it does. Have plugged it in but sound just comes from iPhone not my speakers.

You have to download an app from Apple on your iPhone called "Denon remote app".

Looks like that reciver has a USB port and allows you to attach your iOS USB cable to it and play your music on your receiver