http://www.mp3-box.org/download-youtube-videos-mp3-converter/
How do I download the MP3 track of a Youtube video?
There are many songs on Youtube that I like that aren’t on Itunes or Limewire. I need a free video converter that allows me to download these videos but only the audio and not the video part so I can put in my itunes. Any suggestions?
First u should download the youtube video ,and then with winx video converter,exact the audio with to MP4 button.
http://www.winxdvd.com/video-converter/
Youtube to Mp3 Converter (Best Youtube Downloader)