Browse to YouTube.com and search for the music video you want to download
To copy the address of the music you want to download, use the shortcut CTRL-C (Windows) or COMMAND-C (OS X)
Simply go the http://www.youconv.com , this website allows you to download YouTube Mp3 to you PC easily and for free
Paste the previously copied address into the field. To do this, hit CTRL-V (Windows) or COMMAND-V (OS X) into the field
Click the Audio button to download the music from the YouTube video. It will directly start the download of the music from YouTube
You just download a music from YouTube ! Now enjoy it on your PC, play the YouTube music on your iPhone, copy the music to iTunes or simply play it on Android !