| recordings |
|---|
| 1931-09-18 | I Don't Know Why (I Just Do) | | Benny Goodman and His Orchestra | 3:04 |
| 1942-08-06 | Medley: A Pretty Girl Is Like a Melody / Temptation / I Don’t Know Why (I Just Do) | cover and medley | Frank Sinatra with The Tommy Dorsey Orchestra | 4:01 |
| 1942 | I Don't Know Why | | Bobby Sherwood & His Orchestra | ?:?? |
| 1945-07-30 | I Don’t Know Why (I Just Do) | cover | Frank Sinatra | 2:48 |
| 1945 | I Don’t Know Why (I Just Do) | | Frank Sinatra | 2:47 |
| 1946-03-15 | I Don’t Know Why (I Just Do) | cover | The Nat King Cole Trio | 3:11 |
| 1946-03-15 | I Don’t Know Why (I Just Do) (alternate take) | | The Nat King Cole Trio | 3:08 |
| 1946-03-20 | I Don’t Know Why (I Just Do) | | The Nat King Cole Trio | 2:49 |
| 1946-04-11 | I Don’t Know Why (I Just Do) | | The Nat King Cole Trio | 2:48 |
| 1946-04-12 | I Don't Know Why | instrumental | Charlie Ventura | 2:57 |
| 1946-04-30 | I Don't Know Why | | Georgie Auld | 3:01 |
| 1946-04-30 | I Don’t Know Why | | Georgie Auld & His Orchestra | 2:58 |
| 1946-04 | I Don't Know Why I Love You Like I Do | instrumental | Arnold Ross Quintet | 3:06 |
| 1946-04 | I Don't Know Why I Love You Like I Do | instrumental | Arnold Ross Quintet | 3:10 |
| 1946-05-01 | Frank Sinatra Previews The Voice Of Frank Sinatra / Medley: Someone To Watch Over Me / I Don't Know Why (I Just Do) / These Foolish Things / Why Shouldn't I / You Go To My Head | cover and medley | Frank Sinatra | 6:54 |
| 1946-05-08 | I Don’t Know Why (I Love You Like I Do) | | The Andrews Sisters | 3:16 |
| 1946-05-17 | I Don't Know Why | instrumental | Don Byas Quartet | 3:01 |
| 1946-05-17 | I Don’t Know Why | instrumental | Don Byas | 2:58 |
| 1946-05-29 | I Don't Know Why | | Eddie Heywood and His Orchestra | 3:12 |
| 1946-05 | I Don't Know Why | | Slim Gaillard Quartette | 2:29 |
| 1946-06-07 | I Don’t Know Why (I Just Do) | | Stan Kenton | 4:15 |
| 1946-09-05 | I Don't Know Why | live | Gene Krupa & His Orchestra | 2:26 |
| 1946-09-22 | I Don't Know Why (I Just Do) | live | The Nat King Cole Trio | 3:04 |
| 1946-11 | I Don't Know Why | | Harry James and His Orchestra | 3:05 |
| 1946 | I Don’t Know Why (I Just Do) | | Nat King Cole | 3:11 |
| 1950-06-28 | I Don't Know Why | instrumental | Erroll Garner | 3:28 |
| 1952-03-12 | I Don't Know Why | | Bing Crosby | 2:21 |
| 1952-04-11 | I Don't Know Why | instrumental | Dizzy Gillespie | 2:54 |
| 1954-07-08 | Medley: Let's Fall in Love / Moonglow / I Don't Know Why (I Just Do) / You've Got Me Crying Again | medley | Woody Herman & Erroll Garner | 10:26 |
| 1954-09-26 | I Don't Know Why | cover and instrumental | Max Geldray | 2:15 |
| 1954-10-29 | Ballad Medley (I'm Through With Love, Can't We Be Friends, Don't You Think, I Don't Know Why (I Just Do), If I Had To) | instrumental and medley | Roy Eldridge & Dizzy Gillespie | 11:19 |
| 1954-10-29 | The Ballad Medley: I’m Through With Love / Can’t We Be Friends / Don’t You Think / I Don’t Know Why I Love You Like I Do / If I Had You | instrumental and medley | Roy and Diz | 11:18 |
| 1954 | I Don't Know Why | instrumental | Beryl Booker | 3:05 |
| 1957-10-10 | Ballad Medley: Bewitched, Bothered, and Bewildered / I Don't Know Why I Just Do / How Long Has This Been Going On / I Can't Get Started / Polka Dots and Moonbeams | instrumental and medley | Stan Getz & The Oscar Peterson Trio | 10:13 |
| 1957 | I Don’t Know Why (I Just Do) | cover | Dean Martin | 2:54 |
| 1974 | I Don't Know Why | | Slim Gaillard | 2:26 |
| 1993-07 | I Don't Know Why (I Just Do) | | Lou Donaldson | 5:02 |
| Barn Dance: Tip Toe Through The Tulips/I Don't Know Why/My Mammy | instrumental and medley | Phil Kelsall | 2:56 |
| I Don't Know Why | | Russ Columbo | 3:11 |
| I Don't Know Why | | Frankie Carle | 2:16 |
| I Don't Know Why | | Hoagy Carmichael and His Orchestra | 2:48 |
| I Don't Know Why | cover | Lauren Bacall & Bing Crosby | 2:12 |
| I Don't Know Why | instrumental | Don Byas | 2:53 |
| I Don't Know Why | | Frank Sinatra | 2:52 |
| I Don't Know Why | | Dizzy Gillespie | 2:54 |
| I Don't Know Why | | Roy Eldridge & Dizzy Gillespie | 2:53 |
| I Don't Know Why | cover | Erroll Garner | ?:?? |
| I Don't Know Why | instrumental | Erroll Garner | 3:28 |
| I Don't Know Why | | Frank Sinatra | 2:24 |
| I Don't Know Why | | Frank Sinatra | 2:53 |
| I Don't Know Why | | Frank Sinatra | 2:33 |
| I Don't Know Why | | Frank Sinatra | 2:49 |
| I Don't Know Why | | Frank Sinatra | 2:18 |
| I Don't Know Why | instrumental | Erroll Garner | 3:29 |
| I Don't Know Why | | Frank Sinatra | 2:18 |
| I Don't Know Why | | Elixir | 3:32 |
| I Don't Know Why - I Just Do | | Nat King Cole | 3:12 |
| I Don't Know Why - I Just Do | | Nat King Cole | 3:12 |
| I Don't Know Why (I Just Do) | instrumental | Ray Anthony | 2:49 |
| I Don't Know Why (I Just Do) | | Frank Sinatra | 2:47 |
| I Don't Know Why (I Just Do) | | Ray Anthony | 2:48 |
| I Don't Know Why (I Just Do) | | Kate Smith | 2:55 |
| I Don't Know Why (I Just Do) | | Tommy Sands | 2:47 |
| I Don't Know Why (I Just Do) | | Woody Herman | 1:48 |
| I Don't Know Why (I Just Do) | | Vince Hill with The Eddie Lester Singers | ?:?? |
| I Don't Know Why (I Just Do) | | Frank Sinatra | 2:47 |
| I Don't Know Why (I Just Do) | cover | Brian Hyland | 1:58 |
| I Don't Know Why (I Just Do) | | Frank Sinatra | 2:45 |
| I Don't Know Why (Nat King Cole) | live | New Orleans Shakers | 3:55 |
| I Don't Know Why-I Just Do | | Nat King Cole | 2:47 |
| I Don't Know Why? | | Frank Sinatra | 2:23 |
| I Don't Kwon Why | | Dizzy Gillespie | 2:52 |
| I Don’t Know Know Why (I Just Do) | cover | Dean Martin | 2:53 |
| I Don’t Know Why | cover | Dean Martin | 2:53 |
| I Don’t Know Why | | Bing Crosby & Lauren Bacall | 2:20 |
| I Don’t Know Why | | Bing Crosby feat. Lauren Bacall | 2:18 |
| I Don’t Know Why | cover | Cliff Richard and The Norrie Paramor Strings | 1:57 |
| I Don’t Know Why | cover and live | Geschwister Pfister | 3:39 |
| I Don’t Know Why | cover | Sarah Vaughan | 2:57 |
| I Don’t Know Why | cover | Sarah Vaughan | 2:57 |
| I Don’t Know Why | live | Cliff Richard and The Norrie Paramor Strings | 1:56 |
| I Don’t Know Why | | Cliff Richard | 1:58 |
| I Don’t Know Why | | Nat King Cole | 3:14 |
| I Don’t Know Why | cover | Louis Prima & Keely Smith | 2:01 |
| I Don’t Know Why | cover | Dean Martin | 2:53 |
| I Don’t Know Why | | Dizzy Gillespie | 2:55 |
| I Don’t Know Why (alt) | instrumental | Don Byas Quartette | 3:02 |
| I Don’t Know Why (But I Do) | | Cliff Richard & Norrie Paramor Orchestra | 1:56 |
| I Don’t Know Why (But I Do) | | Cliff Richard | 1:59 |
| I Don’t Know Why (I Just Do) | | Cliff Richard | 1:56 |
| I Don’t Know Why (I Just Do) | | Tommy Dorsey & His Orchestra | 3:06 |
| I Don’t Know Why (I Just Do) | | Benny Goodman | ?:?? |
| I Don’t Know Why (I Just Do) | | Marty Robbins | 2:28 |
| I Don’t Know Why (I Just Do) | | Marty Robbins | 2:23 |
| I Don’t Know Why (I Just Do) | cover | Marty Robbins | 2:26 |
| I Don’t Know Why (I Just Do) | cover | Dean Martin | 2:32 |
| I Don’t Know Why (I Just Do) | cover | Dean Martin | 2:36 |
| I Don’t Know Why (I Just Do) | cover | Dean Martin | 2:57 |
| I Don’t Know Why (I Just Do) | cover | Dean Martin | 2:35 |
| I Don’t Know Why (I Just Do) | cover | Dean Martin | 2:55 |
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