How can you burn music from online radio to cd?

Hi Folks, Is it possible to listen to Itunes online radio and have some software (preferrable free download) extract the audio and then later burn to disk? Thought wave editor (through Nero) might have worked but clashes with Adobe ( I think). Also thought that if a lead came from line out and back into mic or something, that it might work. What software? Jst want some of this Great Itunes radio on disk for my car!
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online radio