iTunes Radio is now a bit more lively, thanks to the addition of ESPN Radio and several local NPR stations. Unlike most of iTunes Radio’s stations, which feature pre-recorded tracks, the new stations are live streams. To access ESPN Radio, play it from Featured Stations in iTunes, the Music app in iOS, or iTunes Radio on the Apple TV. To find the NPR stations, create a new station and search for “NPR”. In our experience, iTunes on the desktop shows only a handful of stations. To add your favorite station, we recommend searching for it in Music on iOS, where you can tap See More to get more search results. follow link
View Extra Audio Details in Snow Leopard
In Snow Leopard, Option-clicking the Volume icon in the menu bar displays a list of sound input and output devices. Choose one to switch to it; it's much easier than using the Sound preference pane. Also, hold Shift and click the icon to set the system volume, which is separate from the general output volume.
iTunes Radio Adds ESPN and Local NPR Stations