- Dianna Agron – lead vocals (1–2, 4)
- Adam Anders – music arranger, vocal arranger, digital editing, producer, soundtrack producer, additional background vocals
- Alex Anders – engineer, digital editing, additional vocal producer, additional background vocals
- Nikki Anders – additional background vocals
- Peer Åström – music arranger, producer, engineer, mixing
- Kala Balch – additional background vocals
- Emily Benford – additional background vocals
- Joshua Blanchard – assistant engineer
- RaVaughn Brown – additional background vocals
- Geoff Bywater – executive in charge of music
- Deyder Cintron – assistant engineer, digital editing, additional background vocals
- Chris Colfer – lead vocals (4, 7)
- Kamari Copeland – additional background vocals
- Darren Criss – lead vocals
- Tim Davis – vocal contractor, additional background vocals
- Tommy Denander – guitars[6]
- Dante Di Loreto – executive producer
- Henrik Edenhed – mixing
- Luke Edgemon – additional background vocals
- Brad Falchuk – executive producer
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- Ryan Gillmor – assistant engineer
- Missi Hale – additional background vocals
- Fredrik Jansson – assistant engineer
- Storm Lee – additional background vocals
- David Loucks – additional background vocals
- Lea Michele – lead vocals (1, 3–4, 6, 8, 10, 13)
- Cory Monteith – lead vocals (1, 4, 8–11, 13)
- Matthew Morrison – lead vocals (12)
- Ryan Murphy – producer, soundtrack producer
- Jeanette Olsson – additional background vocals
- Chord Overstreet – lead vocals (1, 8, 13)
- Tiffany Palmer – additional background vocals
- Martin Persson – music programming
- Ryan Petersen – assistant engineer
- Zac Poor – additional background vocals
- Nicole Ray – production coordinator
- Amber Riley – lead vocals (1–2, 8, 13)
- Naya Rivera – lead vocals (1–2, 4)
- Mark Salling – lead vocals (4–5, 11)
- Drew Ryan Scott – additional background vocals
- Onitsha Shaw – additional background vocals
- Jenna Ushkowitz – lead vocals (2)
- Windy Wagner – additional background vocals
- Joe Wohlmuth – assistant engineer
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