Last fm radio?

Hi,

Im fiddling around with my portfolio and wanted to add the last.fm api and have it play a radio station using the radio.tune/radio.getPlaylist but Im not sure how to get this working. I can do stuff like get album info and tracklisting and favourites etc. but the radio.tune thing doesnt have as much documentation, is this included in the api or is this service not provided? Does anyone know of a good example or a good link to some documentation on the method.

Thanks in advance