Untangling MIDI is a 1988 docu-vertorial (or edu-tisement) about MIDI, stuffed with loving closeups of loads of ugly Yamaha gear and Roland guitar synths, presented by the charming Brad Vinikow... It was rediscovered by Paul Slocum, "a geek artist/musician/hacker living in Dallas, Texas" who develops music programs for Atari 2600s. (Thanks Chuck)