It was a medley, covering several songs previously recorded by jazz musician Glenn Miller, including "In the Mood", "American Patrol", "Little Brown Jug" and "Pennsylvania 6-5000".
The instrumental was a medley of swing jazz hits - "In the Mood", "Cherokee", "American Patrol", "Sing, Sing, Sing", "Don't Be That Way", "Little Brown Jug", "Opus #1", "Zing Went the Strings of My Heart", and "String of Pearls" - that became so popular it even cracked the US Billboard Pop Singles chart (at #31) and Adult Contemporary chart (#20).
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