Radio Tivo

So on the long drive to and fro Vegas I was wondering how cool would it be to have a tivo like solution for radio. So you can just start it for a station you like on a particular day or during a specific time slot whose host you like. Also you would be able to record talk radio programming which you would really like to listen to but cant due to some time conflicts. And on long drives you can just listen to certain songs again and again.

But I guess there will be some compicated legal issues with this.

Assuming there are, another idea would be to be able to "mark" and remember the song on some device integrated into the radio, allowing the listener to later purchase the songs on the list. The usecase being, that I often listen to terrific songs on the radio for the first time and would like to relisten, but trying to remember the song lyrics, finding out the song name from that and digging that around on the internet and then buying it ... ya right!

I think even the AM/FM radio stations (not just XM and Sirius) broadcast the song information (metadata) along with the songs, as is displayed on the dashboard on some of the luxury cars. Either this information can be used to remember the song or if not, wasnt there a google code project that would analyse audio and algorithmically determine its signature or some such?