Who Else Wants to Own a LEGO Mellotron? The classic Mellotron M400 made from Lego. The iconic and ingenious proto-sampler musical instrument that gave the Progressive Rock genre it’s distinctive sound. I’ve taken inspiration from both Andy Grobengieser and Iain Heath in coming up with this Lego Mellotron M400. The Mellotron The Mellotron was invented in 1963 and was effectively built as a home entertainment system. It was a keyboard that played back sounds stored on magnetic tape. When a key was pressed it…