How to extract audio from youtube videos?

I am a big music lover and I always change the format ofmusic. So that I can use it in mobile or iphone or other devices. For that Ihave to use some software through which I can convert audio or video into anyformat like WMV and AVI or MP4. For that I normally use AVS software or freeblue audio to video converter or other software. You can also change the formatof your you tube video in any of them by simply downloading those software fromthe internet or you can just use them online. After that you can download thosevideo or audio to your iphone or computer very easily. So below I am giving youthe name of some web sites from where you can download audio vide convertersoftware or you can convert your media format directly.

Media converter, formatoz, any video converter,cocoonsoftware, cnet, brothersoft, makeuseof, bthese are some websites fromwhere you can easily download those free media converter software. You caneasily use those in your computer or in any other devices. It was really fun tohelp you.