| recordings |
|---|
| 1941-05-07 | I Know Why (from the 20th Century‐Fox film “Sun Valley Serenade”) | | Glenn Miller and His Orchestra | ?:?? |
| 1941 | I Know Why | | The Glenn Miller Orchestra | 3:03 |
| 1941 | I Know Why | | Glenn Miller and His Orchestra | 3:01 |
| 1957-01 | I Know Why | | June Christy | 2:14 |
| 1959-04-22 | I Had The Craziest Dream / I Know Why | instrumental and medley | The Ramsey Lewis Trio | 6:28 |
| 1990-08 | I Know Why | | Glenn Miller Orchestra | 3:56 |
| I know why | | Glenn Miller | 3:48 |
| I Know Why | | Glenn Miller & His Orchestra | ?:?? |
| I Know Why | | Glenn Miller and His Orchestra | 2:59 |
| I Know Why | | Glenn Miller and His Orchestra | 3:02 |
| I Know Why | cover | Mel Tormé | 3:51 |
| I Know Why | cover and instrumental | James Last | 3:32 |
| I Know Why | | Glenn Miller Orchestra | 3:13 |
| I Know Why | | The Glenn Miller Orchestra directed by Wil Salden | 3:56 |
| I Know Why | | The Glenn Miller Orchestra | 3:01 |
| I Know Why | | The Glenn Miller Orchestra feat. Paula Kelly & The Modernaires | 2:54 |
| I Know Why | | The Glenn Miller Orchestra | 3:00 |
| I Know Why | | Glenn Miller Orchestra directed by Wil Salden | 4:01 |
| I Know Why | | The New Glenn Miller Orchestra | 3:13 |
| I Know Why | | Glenn Miller | 2:58 |
| I Know Why | | Glenn Miller | 3:01 |
| I Know Why | instrumental | David Whitman | 5:08 |
| I Know Why | | Glenn Miller | 4:39 |
| I Know Why | | Glenn Miller and His Orchestra | 3:00 |
| I Know Why | | Glenn Miller | 2:59 |
| I Know Why | | The Glenn Miller Orchestra | 2:59 |
| I Know Why | | The Glenn Miller Orchestra | 3:06 |
| I Know Why | | Glenn Miller Orchestra | 3:03 |
| I Know Why | | Ray Anthony | 2:58 |
| I Know Why | | Glenn Miller | ?:?? |
| I Know Why | | Glenn Miller | 2:55 |
| I Know Why | | Glenn Miller | 4:36 |
| I Know Why | | Glenn Miller | ?:?? |
| I Know Why | | Glenn Miller | 3:01 |
| I Know Why | | Glenn Miller | 3:00 |
| I Know Why | | Glenn Miller | 3:00 |
| I Know Why | | Glenn Miller | 2:58 |
| I Know Why | | Glenn Miller | 2:59 |
| I Know Why | | Glenn Miller | 3:03 |
| I Know Why | | Glenn Miller | ?:?? |
| I Know Why | | Glenn Miller/Paula Kelly | 3:00 |
| I Know Why | | Glenn Miller | 3:00 |
| I Know Why | | Glenn Miller | 4:36 |
| I Know Why | | Glenn Miller | 3:00 |
| I Know Why | | Glenn Miller | 2:59 |
| I Know Why | | Glenn Miller | 3:00 |
| I Know Why | | Glenn Miller | 3:02 |
| I Know Why | | Glenn Miller | 3:01 |
| I Know Why | | Glenn Miller | 3:14 |
| I Know Why | | Glenn Miller | 3:00 |
| I Know Why | | Glenn Miller | 2:59 |
| I Know Why | | Glenn Miller | 3:03 |
| I Know Why | | Glenn Miller | 3:00 |
| I Know Why | | Glenn Miller | 2:58 |
| I Know Why | | Glenn Miller | 3:00 |
| I Know Why | | Glenn Miller | 2:46 |
| I Know Why | | Glenn Miller | 3:02 |
| I Know Why | | Glenn Miller | 3:00 |
| I Know Why | | Glenn Miller | 3:05 |
| I Know Why | | Glenn Miller | 3:05 |
| I Know Why | | Glenn Miller | 3:00 |
| I Know Why | | Glenn Miller | 3:01 |
| I Know Why | | Glenn Miller | 3:00 |
| I Know Why | | Glenn Miller | 3:03 |
| I Know Why | | Glenn Miller | 3:00 |
| I Know why (And So Do You) | | Glenn Miller and His Orchestra | 4:35 |
| I Know Why (and So Do You) | | Glenn Miller | 2:59 |
| I Know Why (and So Do You) | | Glenn Miller | 3:50 |
| I Know Why (and So Do You) | | Glenn Miller | 3:01 |
| I Know Why (and So Do You) | | Glenn Miller | 3:03 |
| I Know Why (And So Do You) | | Glenn Miller and His Orchestra | 2:58 |
| I Know Why (And So Do You) | | Glenn Miller | 3:00 |
| I Know Why (And So Do You) | | Glenn Miller | 3:00 |
| I Know Why (And So Do You) | | Glenn Miller | 2:59 |
| I Know Why (And So Do You) | | Glenn Miller | 3:36 |
| I Know Why (And So Do You) | | Glenn Miller and His Orchestra | 3:00 |
| Ma, I Miss Your Apple Pie / What More Can I Say? / I Know Why | instrumental and medley | Reginald Dixon | 3:13 |
