Disc1
| 1 | What Is Love 2k9 (Klaas radio edit) | Klaas meets Haddaway | 3:24 |
| 2 | What Is Love 2k9 (Klaas club mix) | Klaas meets Haddaway | 5:23 |
| 3 | What Is Love 2k9 (Klaas Impact mix edit) | Klaas meets Haddaway | 3:24 |
| 4 | What Is Love 2k9 (Klaas Impact mix) | Klaas meets Haddaway | 5:23 |
| 5 | What Is Love 2k9 (Clip Version Non Censurée) | Klaas meets Haddaway | 3:08 |