Appears on releases
| # | Title | Length | Track artist | Release title | Release artist | Release group type | Country/Date | Label | Catalog# |
|---|---|---|---|---|---|---|---|---|---|
| Official | |||||||||
| 3.4 | Mercy (acoustic version) | 3:41 | Duffy | Arte Summer of Girls | Various Artists | Album + Compilation |
| EMI (EMI Records, or EMI Music only if there is no other imprint) | |
| 1.10 | Mercy | 3:35 | Duffy | Acoustic Rewind | Various Artists | Album + Compilation |
| Universal (plain logo “Universal” used by Universal Music and Universal Pictures) | 5373177 |
| 3.1 | Mercy (acoustic version) | 3:34 | Duffy | Just Acoustic: 80 Classic Acoustic Songs | Various Artists | Album + Compilation |
| Rhino (reissue label) | JK231487 |
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