"In the Mood" is a popular big band-era #1 hit recorded by American bandleader Glenn Miller. It topped the charts for 13 straight weeks in 1940 in the U.S. and one year later was featured in the movie Sun Valley Serenade. In 1983, the Glenn Miller recording from 1939 was inducted into the Grammy Hall of Fame. In 1999, National Public Radio (NPR) included the 1939 Glenn Miller recording on RCA Bluebird on the NPR 100, the list of "The 100 most important American musical works of the 20th century".