Very honor to help you, There are no onespecialized toolstodownload Youtube videos, most Youtube user rely on the third-software, I recommen Aneesoft Free Youtube downloader, It is free and runs well. thank you.
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there is a website called www.keepvid.com just type the youtube song's URL in the box displayed at the top in the homepage of keepvid and click on download...u also have to download the FLV player which will be displayed when u start downloading the video...this all is free