Real-Time Improvisation by David K. Barton, recorded August 13, 2019. PLATO’s PilotHouse, Michiana. PLATO, No. 1185a, “Megalith 10, part 1”, 00:02-13:02; with PLATO, No. 1185b, “Megalith 10, part 2”, 00:06-13:06 (both: David, Boyd Nutting, Scott Hatt, & John Richez, 8-13-2002).