I have a Denon AVR 4308CI Receiver/Surround sound how can I stream music from iTunes?

There are several options available to do this from music servers, bridges and networking from your computer. You may want to check out something like AVS forums. That said, you may want to look at a Logitech Squeezebox (or Sonos). I give you these two because, I personally use the squeezebox and am very satisfied with what I get out of it for the $ I put into it. I am pretty sure it has access to iTunes now, just not sure as I use Pandora and streaming radio practically all the time I am listening. The other reason I suggest these two options is that everything being relative, you have a nicer AVR (i.e. not a boxed HT setup) and can probably justify putting a couple of hundred dollars in this to get both the features and the sound they are capable of producing.

According to Denon, you need to purchase a separate iPod dock. If you are streaming from a computer hard drive, then a 3.5 double ended cable with an RCA double male may work when connected between the headphone or speaker jack on your computer and a line in jack on the receiver.

Electric Light Orchestra

Yes but you would have to connect it to your computer or if you have an i-phone you might be able to do it by connecting it to your i-phone...