Just Convert it, how it works how to convert the youtube videos in to mp3 songs

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hi mylot friends, Every Thursday , there is section on computer knowledge in Eenadu news paper, the paper in published in Telugu language, I have downloaded some old hindi songs ,in real player and daily I am playing those songs on my desk top screen and listening the music with scenes, I wish to convert those video songs to mp3 songs, so that I can upload those mp3 songs in my cellphone,so that when ever I require I can listen the songs, today I have opened the site “just conver it” but I have not understand it, is there any body knows about this just convert it site or any body know how to convert video songs in to mp3 songs,have a nice day