You won't be able to run iTunes and I am pretty sure there is no such app that will offer the same functionality. The surface RT however does have a usb drive that will allow you to read anything with internal flash storage.
One recommendation is you can try a tablet with a clover trail intel chip. They say they run faster than the ARM based chip that is in the surface RT AND you can run any normal windows desktop applications such as iTunes. By the way, if I were to ever get a clover trail tablet, I'd go for the ASUS Smart tablet which offers the most bang for your buck in the clover trail category