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.
American trombonist and band leader Glenn Miller (1904 - 1944) performing with the Glenn Miller Army Air Force Band to entertain the troops. Original Publication: Picture Post - 1782 - Glenn Miller - unpub. (Photo by Felix Man/Getty Images)