I Know Why (And So Do You)

"I Know Why (And So Do You)" is a song title, most notably associated with the Glenn Miller Orchestra. The song, featuring a swing or big band style, achieved considerable popularity during the World War II era. Its simple, direct title suggests a shared understanding between the singer and the listener, hinting at themes of love, romance, or perhaps a shared secret or experience. The ambiguity inherent in the title allows for broad interpretation and likely contributed to its widespread appeal. Although covered by numerous artists, the Glenn Miller Orchestra's version remains the most widely recognized and frequently referenced. The song typically evokes a nostalgic feeling associated with the 1940s and the swing era.