"In the Mood" is a popular big band-era jazz standard recorded by American bandleader Glenn Miller. "In the Mood" is based on the composition "Tar Paper Stomp" by Wingy Manone. The first recording under the name "In the Mood" was released by Edgar Hayes & His Orchestra in 1938. In 1983, the Glenn Miller recording from 1939 was inducted into the Grammy Hall of Fame. In 2004, the recording was inducted into the Library of Congress National Recording Registry which consists of recordings that are "culturally, historically, or aesthetically significant." In 1999, National Public Radio (NPR) included the 1939 Glenn Miller recording in its list of "The 100 most important American musical works of the 20th century". Glenn Miller's "In the Mood", with "I Want to Be Happy" on the B-side, became the best-selling swing instrumental.

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