If there are ranking among converters, it is possible that Free YouTube to MP3 Converter is among the top ten.
This excellent utility is for public and free. It also offers the possibility to extract the sound of video files downloaded from youtube.com and will be automatically converted into MP3 and save it at the destination folder that has been previously selected.
In this way, you can get the songs circulating youtube in streaming video formats in a very simple and practical way.
In addition, this great utility, has many options to optimize the quality of sound and in turn, the possibility of assigning title, name of author, interpreter, etc.
A tool with such unique utilities, gives you a range of options that are not so common but very useful.