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Disc1
| 1 | Silence (radio edit) | Delerium feat. Sarah McLachlan | 4:06 |
| 2 | Silence (Airscape remix) | Delerium feat. Sarah McLachlan | 3:48 |
| 3 | Silence (album version) | Delerium feat. Sarah McLachlan | 6:37 |
| 4 | Silence (call out research hook #1) | Delerium feat. Sarah McLachlan | 0:12 |
| 5 | Silence (call out research hook #2) | Delerium feat. Sarah McLachlan | 0:13 |