Copland’s Symphony No. 3 was recorded on February 5–7, 1953, in the Northrop Auditorium, Minneapolis, under the auspices of the Koussevitzky Music Foundation, in commemoration of its tenth anniversary. Mercury employed here its unique recording technique based on the use of a single Neumann U-47 microphone — in this instance hung 15 feet directly over the conductor’s podium. A Fairchild full-track quarter-inch tape machine running at 15 inches per second was used for recording the performances. The first generation master tape was not available for CD remastering, so a 1965 dub tape was used. The Plangent Process stabilized the wow and flutter on the second-generation tape. Symphony No. 3 was first released on MG50018.