A famous bootleg album
It was actually a bit disappointing in some ways. I had always assumed that Air Structures was a dis-jointed piecemeal recording which just highlighted bits of a continuous show. However it would seem that it was actually a pretty good version of the actual event. So the DGM issue was not all I had hoped it would be. I had thought there might have been a really long version of "Index of Metals", but sadly not.