I Know Why ( and So Do you ) - wikipedia I Know Why ( and So Do you ) 1941 sheet music cover featuring Glenn Miller, Leo Feist, New York. 1941 78 single release by Glenn Miller and His Orchestra, RCA Bluebird B - 11230 - A. `` I Know Why ( And So Do You ) '' is a 1941 song by Glenn Miller and His Orchestra. The song appeared in the 20th Century Fox movie Sun Valley Serenade. The song was also released as an RCA Bluebird 78 single. Contents 1 Background 2 Personnel 3 Album Appearances 4 References 5 Sources 6 External links Background The song was written by Mack Gordon, lyrics, and Harry Warren, music. The song is lip - synched by Lynn Bari in the movie Sun Valley Serenade. Pat Friday sang the vocals with John Payne and The Modernaires. The single, RCA Bluebird B - 11230 - A, reached no. 18 on the Billboard pop singles chart in a one - week chart run. The single release featured vocals by Paula Kelly and The Four Modernaires. The B side of the single was `` Chattanooga Choo Choo '', which de facto, was treated as the A side. The Manhattan Transfer, Mel Torme, Richard Himber And His Orchestra with Johnny Johnston and the Joseph Lilley Ensemble on vocals, Ray Anthony, Anne Shelton with Ambrose & his Orchestra, June Christy, Frankie Sardo on 20th Fox Records, Lionel Hampton, Jean Peters, Joan Regan, Michael Feinstein and George Shearing, Babik Reinhardt, Dick Smothers, the Red Garland Trio, Orchestra Coco, the Michael Rose Orchestra, Teddy Petersen, Falconaires, US Air Force Band of the Rockies, Max Greger, Syd Lawrence, the Dino Olivieri Orchestra with refrain by Bruno Pallesi, David Pell, Diana Panton with Red Schwager on the album Red, and Robert Clary have also recorded the song. The 1941 Glenn Miller recording was featured in the 1990 Warner Bros. movie Memphis Belle and the 2017 film The Shape of Water which was nominated for 13 Academy Awards. Personnel The personnel on the 1941 recording by Glenn Miller and his Orchestra released as a 78 single were : Paula Kelly, The Modernaires ( vo ), Billy May, John Best, Ray Anthony, R.D. McMickle ( tp ), Glenn Miller, Jim Priddy, Paul Tanner, Frank D'Annolfo ( tb ), Hal McIntyre, Wilbur Schwartz ( cl, as ), Tex Beneke, Al Klink ( ts ), Ernie Caceres ( bar ), J.C. McGregor ( p ), Jack Lathrop ( g ), Trigger Alpert ( sb ), and Maurice Purtill ( dm ). Album appearances The song appears on the following albums : Remember Glenn Miller, 20th Century, 1973 The Complete Glenn Miller, Vol. 6 ( 1940 - 1941 ), RCA Bluebird Glenn Miller : The Popular Recordings ( 1938 - 1942 ), RCA Bluebird, 1989 The Ultimate Glenn Miller, RCA Bluebird, 1993 The Essential Glenn Miller, RCA Bluebird, 1995 References Jump up ^ Song artist 6 - Glenn Miller.tsort.info. Sources Flower, John ( 1972 ). Moonlight Serenade : a bio-discography of the Glenn Miller Civilian Band. New Rochelle, NY : Arlington House. ISBN 0 - 87000 - 161 - 2. Miller, Glenn ( 1943 ). Glenn Miller 's Method for Orchestral Arranging. New York : Mutual Music Society. ASIN : B0007DMEDQ Simon, George Thomas ( 1980 ). Glenn Miller and His Orchestra. New York : Da Capo paperback. ISBN 0 - 306 - 80129 - 9. Simon, George Thomas ( 1971 ). Simon Says. New York : Galahad. ISBN 0 - 88365 - 001 - 0. Schuller, Gunther ( 1991 ). Volume 2 of The Swing Era : the Development of Jazz, 1930 -- 1945 /. New York : Oxford University Press. ISBN 0 - 19 - 507140 - 9. External links Lyrics by Mack Gordon. Glenn Miller Glenn Miller Orchestra The Modernaires The Crew Chiefs Compositions `` Moonlight Serenade '' `` Room 1411 ( Goin ' to Town ) '' `` Sold American '' `` Solo Hop '' `` Introduction to a Waltz '' `` Annie 's Cousin Fannie '' `` Dese Dem Dose '' `` When Icky Morgan Plays the Organ '' `` Doin ' the Jive '' `` Community Swing '' `` Sometime '' `` Boom Shot '' `` Seven - O - Five '' `` I Sustain the Wings '' `` I 'm Headin ' for California '' `` I Swung the Election '' `` Wings on Parade : The Flaming Sword of Liberation '' `` After Tonight '' `` Morning Mood '' `` The Technical Training Command '' `` Jinky '' `` Let 's Give Them a Break '' `` SHAEF Presents '' `` Chesterfield # 1 '' `` Chesterfield # 2 '' `` 125 Jazz Breaks for Trombone '' `` You 're Breakin ' Me Down '' `` Tomorrow 's Another Day '' `` Harlem Chapel Chimes '' `` Basin Street Blues '' Billboard hit records Solo Hop ( 1935 ) Every Day 's a Holiday ( 1938 ) Moonlight Serenade ( 1939 ) Little Brown Jug ( 1939 ) The Woodpecker Song ( 1940 ) Pennsylvania 6 - 5000 ( 1940 ) Tuxedo Junction ( 1940 ) In the Mood ( 1940 ) Stardust ( 1940 ) Danny Boy ( 1940 ) Crosstown ( 1940 ) The Nearness of You ( 1940 ) The Song of the Volga Boatmen ( 1941 ) It Happened in Sun Valley ( 1941 ) Chattanooga Choo Choo ( 1941 ) I Know Why ( And So Do You ) ( 1941 ) Elmer 's Tune ( 1941 ) I Dreamt I Dwelt in Harlem ( 1941 ) A String of Pearls ( 1942 ) Moonlight Cocktail ( 1942 ) ( I 've Got a Gal In ) Kalamazoo ( 1942 ) At Last ( 1942 ) American Patrol ( 1942 ) Serenade In Blue ( 1942 ) That Old Black Magic ( 1943 ) It Must Be Jelly ( ' Cause Jam Do n't Shake like That ) ( 1944 ) Here We Go Again ( 1944 ) Albums Glenn Miller ( 1945 ) Glenn Miller Masterpieces, Volume II ( 1947 ) Glenn Miller Plays Selections From the Film `` The Glenn Miller Story '' ( 1954 ) The Glenn Miller Carnegie Hall Concert ( 1958 ) Pure Gold ( 1975 ) Civilian Band alumni Trigger Alpert Ray Anthony Tex Beneke Johnny Best Ernie Caceres Addison Collins Jr. Johnny Desmond Ray Eberle Jerry Gray Bobby Hackett Peanuts Hucko Al Klink Jack Lathrop Norman Leyden Hal McIntyre Ray McKinley Artie Malvin Billy May Ralph Patt Mel Powell Wilbur Schwartz George Siravo Charlie Spivak Kay Starr Paul Tanner Filmography The Big Broadcast of 1936 ( 1935 ) Sun Valley Serenade ( 1941 ) Orchestra Wives ( 1942 ) Film short Upbeat in Music ( 1943 ) Books Glenn Miller 's Method for Orchestral Arranging ( 1943 ) Related articles Discography Bluebird Records RCA Victor Brunswick Records Dorsey Brothers Orchestra The Glenn Miller Story The Glenn Miller Story ( soundtrack ) ( 1954 ) Glenn Miller Orchestra ( 1956 -- present ) Glenn Miller Time Retrieved from `` https://en.wikipedia.org/w/index.php?title=I_Know_Why_(And_So_Do_You)&oldid=829668869 '' Categories : Glenn Miller songs Songs with music by Harry Warren Songs with lyrics by Mack Gordon 1941 songs Songs written for films Jazz compositions Jazz songs Talk Contents About Wikipedia Deutsch Norsk Edit links This page was last edited on 10 March 2018, at 01 : 29. Text is available under the Creative Commons Attribution - ShareAlike License ; additional terms may apply. By using this site, you agree to the Terms of Use and Privacy Policy. Wikipedia ® is a registered trademark of the Wikimedia Foundation, Inc., a non-profit organization. About Wikipedia

Question: who wrote i know why and so do you
Answer: Mack Gordon