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Disc1
| 1 | Union (Radio Edit) | Rebecca & Fiona | 3:56 |
| 2 | Union (Club Mix) | Rebecca & Fiona | 6:12 |
| 3 | Union (Instrumental) | Rebecca & Fiona | 6:12 |
| 1 | Union (Radio Edit) | Rebecca & Fiona | 3:56 |
| 2 | Union (Club Mix) | Rebecca & Fiona | 6:12 |
| 3 | Union (Instrumental) | Rebecca & Fiona | 6:12 |