Help setting up Airport Exposes

Hi, I'm finally taking the plunge into computer audio and have a question. I want to put my music and Itunes on an external usb drive, hook it up to a router and feed the AE without involving a computer. Can that be done our do I need to have my laptop involved somehow?

You answered my question exactly, thank you. It looks like I will have to run a PC to make it work. It would have been nice if that wasn't necessary. What minimum specs do you recommend for the PC? Right now I'm running a netbook on XP with limited horsepower. Thanks.
Glad my answer was on point! As far as the PC goes, you can get away with a really basic low end machine--all you need to be able to run is the OS (windows) and iTunes. iTunes isn't very intensive at all and I think you could probably get the netbook to work fine. Otherwise and old surplus PC ought to do just fine.
Thanks for the added info. Nice to learn Itunes doesn't make a lot of demands. In my neck of the woods CL has tons of 2_3 year old laptops for practically free. One of them should be able to do the trick.