Glenn Miller - In The Mood "In the Mood" is a song popularized by the American bandleader Glenn Miller in 1939, and one of the best-known arrangements of the big band era. Miller's rendition topped the charts one year later and was featured in the 1941 movie Sun Valley Serenade.
Major Glenn Miller (1904 - 1944). While he was traveling to entertain U.S. troops in France during World War II, Glenn Miller disappeared in bad weather over the English Channel. The Glenn Miller Orchestra was re-formed after the war and continues to record and perform to this day.