The Center for Social Media at American University has a video and related report, Code of Best Practicies in Fair Use for Online Video. In spite of the "tv-ist" title, it all applies to audio also, of course. Also check out the video, Remix Culture: Fair Use Is Your Friend.
Sep. 12, 2016 -- The original links on this post were broken, but fixed today. Also, here is an alternative treatment of this subject, --Dennis