Stereophonic sound recording, which attempts to provide a more natural listening experience by reproducing the spatial locations of sound sources in the horizontal plane, was the natural extension to monophonic recording, and attracted various alternative engineering attempts. The ultimately dominant "45/45" stereophonic record system was invented by Alan Blumlein of EMI in 1931 and patented the same year. EMI cut the first stereo test discs using the system in 1933 (see Bell Labs Stereo Experiments of 1933) although the system was not exploited commercially until much later. COUNT 5
QSN1 What did Alan Blumlein event? ANS1 stereophonic record system QSN2 When did EMI create the first stereo discs? ANS2 1933 QSN3 What was the benefit of 45/45 stereo sound? ANS3 more natural listening experience QSN4 What year was stereo sound patented?  ANS4 1931 QSN5 How was the commercial success of stereo sound in the 1930s? ANS5 was not exploited commercially until much later.