Youtube to MP3 without convertation/download

Hi,
I want to know is it possible to get mp3 of the youtube videos directly without downloading and converting videos ? I have find site youtube-mp3. org which can do this. I am very interested how can they do this.
I am als programmer and if you have any idea of implementing this let me know and I will try to create some script for this.
Regards.

See original post by trecords