| recordings |
|---|
| 1965-12-22 | Why | | The Byrds | 2:39 |
| 1965-12-22 | Why (alternate/RCA Studios version) | | The Byrds | 2:44 |
| 1966-01-24 | Why (single version) | | The Byrds | 3:03 |
| 1966-02-21 | Why | | The Byrds | 2:55 |
| 1966-02-21 | Why | | The Byrds | 2:47 |
| 1967-12 | Why | cover and live | Tomorrow | 3:23 |
| Time Between / Why | cover and medley | The Mock Turtles | 3:17 |
| Why | cover | Kevin Robertson | 2:58 |
| Why | cover | Tomorrow | 3:57 |
| Why | | The Byrds | 2:47 |
| Why | | The Byrds | 3:00 |
| Why | | The Byrds | 2:48 |
| Why | | The Byrds | 2:47 |
| Why | | The Byrds | 2:58 |
| Why | | The Byrds | 2:46 |
| Why | | The Byrds | 2:47 |
| Why | | The Byrds | 3:00 |
| Why | | The Byrds | 3:03 |
| Why (alternative version) | | The Byrds | 2:42 |
| Why (mono, single version) | | The Byrds | 3:01 |
| Why (mono) | | The Byrds | 2:53 |
| Why (single version) | | The Byrds | 3:03 |
| Why (stereo) | | The Byrds | 2:49 |
