YouTube - Niki Belucci 2010-07-09 Italy Milano Club Borgo Del Temp Perso2.MPG (http://www.youtube.com/watch?v=Zy7Y1B6a7aM)
I want this song from this video can you tell me tnx

If you use Firefox it's easy: https://addons.mozilla.org/en-us/firefox/addon/youtube-to-mp3/

You can try to use converters that extract audio from online videos, like Zamzar for example, I think there is a page on this website that can do that. As another option you can go to MP3Pole (http://mp3pole.com/) where you can find a lot of free mp3 files to download.