When it comes to ease of use, safety, efficiency, and site support, WonderFox Free HD Video Converter Factory stands out among lots of YouTube songs downloaders. This YouTube video songs free downloader keeps updating to cope with the constantly changes of video encryption algorithm. Though it is free, it can download YouTube music to USB, PC, or other devices in a needed format. You can convert the downloads to 500+ formats like MP4, MP3, etc. It is not only a YouTube downloader but also supports Dailymotion, Twitter, Facebook and more sites.