Today in 1932, Duke Ellington’s band records in stereo – 20 years before its time

Today in 1932, Duke Ellington’s band is recorded in stereo by RCA Victor. Engineers used two complete recording set-ups to make simultaneous master discs of the same performances. Why? No one really knows, but the microphone placements resulted in a stereo recording, with one track on each master cutter. All of that took place more than 20 years before technology allowed the commercial reality of stereo.