| Name | Character | Episodes |
|---|---|---|
| Ryan Tedder | Self - Mentor | 2 |
| Jennifer Nettles | Self - Mentor | 1 |
| Bryan Adams | Self | 1 |
| Fergie | Self - Mentor | 1 |
| Boy George | Self - Mentor | 1 |
| Shania Twain | Self - Mentor | 1 |
| Julia Michaels | Self - Mentor | 1 |
| Jann Arden | Self - Mentor | 1 |
| Sarah McLachlan | Self - Mentor | 1 |
| Alessia Cara | Self | 1 |
| Akiel Julien | Self - The Revel Boys | 1 |