Video Sharer can help youits a software with download, convert and edit functions.especial for its download files from various sites by automatic capture the URL.and convert to almost all the formats...
I think that you do, below is a free one: http://download.cnet.com/Free-YouTube-to-MP3-Converter/3000-2194_4-10665553.html?tag=mncol copy-paste it, then click on download now.