hi! I think this tutorial might help you: http://www.mymusictools.com/articles...ube-to-mp3.htm It was useful for me as I'm looking for a decent YouTube downloader so give it a try

There are many ways for us to download YouTube videos as mp3 files. Besides using the above ways, I found it was also easy to take audio from YouTube video as mp3 files with other programs. You won't lose any data when you use this way to take audio files, as you are just do it by recording from speakers. Without pasting any URL or install addons, all you to do is to play the videos and then record the audio.

Perhaps some ideas you are referring that need to be paid. Wanna some free online services to do this. If so, check this free online video capture software, only specify the URL from YouTube and then start downloading. But this tool download videos directly, you may use streaming audio recorder like audacity to record audio part only in case the sound quality lost.