YouTube has recently become a very popular web site for music streaming. But YouTube developers are not that eager to add MP3 among supported formats. Thus, if you want to share your favorite song with friends you should convert it in a video format. I'll explain how to do it.
Step 1: get the necessary software
Go to http://www.freemake.com/free_video_converter
and download the latest version of Freemake Video Converter.
I remind you that the program is absolutely free and doesn't contain viruses or ads.