No brainer idea: buy songs off the radio

Here's a story from the Telegraph in the UK. Great idea. You hear a song you like, you push a button on your car radio or playback device at home and you download the music...instantly. Cool idea, too. It's good for radio stations. It's great for the record industry. It's even good for car manufacturers.

What's the problem?

http://www.telegraph.co.uk/connected/main.jhtml?xml=/connected/2008/08/28/dlradio128.xml