| A | HairWritten-By – MacDermot*, Ragni*, Rado* |
3:28 |
| B | What Is Happy?Arranged By – Artie SchroeckWritten-By – Kornfeld*, Cowsill*, Cowsill*, Duboff* |
2:29 |
| Category | Artist | Title (Format) | Label | Category | Country | Year |
|---|---|---|---|---|---|---|
| K 14026 | The Cowsills | Hair (7", Single) | MGM Records | K 14026 | US | 1969 |
| 14026X | The Cowsills | Hair / What Is Happy? (7", Single) | MGM Records | 14026X | Canada | 1969 |
| 61 628 | The Cowsills | Hair (7", Single) | MGM Records | 61 628 | France | 1969 |
| KGC 196 | The Cowsills | Hair / What Is Happy? (7", Single, RE) | MGM Records | KGC 196 | US | Unknown |
| MGMK 14026 | The Cowsills | Hair (7", Single) | MGM Records | MGMK 14026 | New Zealand | 1969 |