| Artist name | Roles | Recordings |
|---|---|---|
| Knowledge (British rapper) | vocal | Speak on It |
| Serj Tankian | upright piano | Speak on It |
| Artist name | Roles | Recordings |
|---|---|---|
| Knowledge (British rapper) | vocal | Speak on It |
| Serj Tankian | upright piano | Speak on It |
| Artist name | Roles | Recordings |
|---|---|---|
| Knowledge (British rapper) | vocal | Speak on It |
| Serj Tankian | upright piano | Speak on It |