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  Here is a Step by Step Tutorial

Downloading the Ringtone           
Step 1-Copy the URL of the music video on Youtube. 
The URL should look like this : http://www.youtube.com/watch?v=iWtJUoNQmiA
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          Step 2-Go to http://www.video2mp3.net and paste the URL in the text box above the convert    button.
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          Step 3-Press Convert and once it has converted. After you convert a prompt will come and you can download the file.
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          Step 4-Locate the file on your computer. The file is most likely located in 
C:/Users/(Your User)/Downloads or C:/Users/(Your User)/Documents/Downloads.
 If it isn't, then check your browser's settings and find the download location.
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