Yesterday it was Negative Approach at Mudd Club in '82, and a few days prior, it was Minor Threat covering Government Issue's song "Asshole" - dedicated to Harley Flannegan of the Cro Mags. These are the sort of things you will find on the new blog, "More Than a Witness: A Hardcore Bootleg Archive".  Creator Chris Prorock is something short of a saint for transferring these crackly old tapes to mp3 for all of us to enjoy.