Alton Glenn Miller (March 1, 1904presumably December 15, 1944), was an American jazz musician, arranger, composer, and band leader in the swing era. He was one of the best-selling recording artists from 1939 to 1942, leading one of the best known "Big Bands". Miller's signature recordings include, "In the Mood", "Tuxedo Junction", "Chattanooga Choo Choo", "Moonlight Serenade", "Little Brown Jug", and "Pennsylvania 6-5000". While travelling to entertain U.S. troops in France during World War II, Miller's plane disappeared in bad weather. His body was never found. "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. The song is an anomaly to chart purists. "In The Mood" was released in the period immediately prior to the inception of retail sales charts in Billboard magazine. While it led the Record Buying Guide (jukebox list) for 13 weeks, it never made the top 15 on the sheet music charts, which were considered by many to be the true measure of popular.