How to download just the audio of youtube video files?

I want only the audio of a few youtube videos. I know how to download youtube videos. But I just want the audio of a few youtube videos. The audio files will be much smaller in size than the video files. I have a slow internet connection, so it will take much less time to download audios rather than the videos. Is there any possible way to do that?How to download just the audio of youtube video files?
Hey,i recommend you use a youtube downloader. this is a free and good youtube downloader. http://www.leawo.com/youtube-download/ after you finish download it you still should convert it to other popular formats such as wmv,mp3,mp4, avi,3gp,3gp2 etc. downlad it freely here --------------------------


For Windows: http://www.google.com/search?hl=en%26amp;newwindow=1%26amp;q=leawo+flv+converter%26amp;aq=f%26amp;aqi=g1g-c1g4%26amp;oq=


For MAC: http://www.apple.com/downloads/macosx/video/leawomacvideoconverter.html


all can be completed by several mouse clicks, just have a try.