App to record streaming audio on iPhone?

[BERFAB]

TuneIn Radio Pro is a neat device that allows recording of streams for some 50,000 available online stations. Neat device. I use it to record BBC 1 morning shows overnight to listen to on my way to work in the morning in Boston.

I also record hours of jazz streams for playback in the car. I sometimes just play the stations live in the car, but the data stream for that makes it a bit expensive, so recording and playing back makes much more sense.

I would like to be able to do the same thing with Pandora (not part of TuneIn) but I can't seem to find any apps that record audio being streamed through the phone itself (i.e. outside of TuneIn).

Is this possible?

Thanks
-B