In this article, we’ll show you how easy it is to download just the audio file from any streaming video and save it to your hard drive for offline listening.
http://www.pcworld.com/article/2852325/how-to-download-audio-from-any-streaming-video.html
DawsonITE is a blog devoted to Educational Technology. It's compiled by Rafael Scapin, Coordinator of Educational Technology at Dawson College in Montreal (Canada).