Search iTunes radio stations using playlists
If you use iTunes radio stations, you may have noticed that you can’t search in the Radio list; the search field is dimmed. But OS X Hints reader osxpounder pointed out that you can search if you put the radio stations in a playlist.
To do this, create a new playlist, then click on Radio in the iTunes source list. (If you don’t see it, choose iTunes > Preferences, then click on General, then check Radio in the Show section.) Click on a disclosure triangle to show the radio stations in a genre, such as Alternative, Blues or Classical. You can either choose specific radio stations and drag them to your playlist, or, if you want, select all the radio stations in a genre and drag them to the playlist. (You can’t drag the genre name to the playlist, though.) You can then search for a specific station within that playlist.
Also, you should display the Contents column in iTunes: choose View Options, when your playlist is selected, then check Comments. If so, your search will not only look at the names of the stations, but also the descriptions.