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On this day in music history: April 13, 1940 - "In The Mood" by Glenn Miller & His Orchestra hits #1 on the Billboard Record Buying Guide (jukebox list existing prior to the Best Sellers chart) for 13 weeks. Written by Joe Garland, Glenn Miller, and Andy Razaf, the song is recorded on August 1, 1939 and is released on RCA Victor's Bluebird Records imprint. It will become not only one of the definitive records of the big band era, but one of the most influential musical works of the twentieth century. It will be one of the most widely covered songs of the era with versions also recorded by Xavier Cugat, Duke Ellington, Benny Goodman, The Andrew Sisters, and Artie Shaw, to more contemporary artists including Bette Midler and The Brian Setzer Orchestra. Glenn Miller's original recording of "In The Mood" is inducted into the Grammy Hall Of Fame in 1983.