Columbia Records introduces the 33 1/3 LP (“long playing”) record at New York's Waldorf-Astoria Hotel[?], featuring 25 minutes of music per side, compared to the four minutes per side of the 78 rpm record, the previous standard.
... War: Russian troops in Korea retreat toward Manchuria followed by 100,000 Japanese troops.
April 30 - Louisiana Purchase Exposition World's Fair opens in Saint ...