Commemorating the centennial of Mercer's birth, this documentary is part biography, part archive, and part recontextualization, taking Mercer's tunes and putting them in the hands of modern singers like Jamie Cullum and Dr. John to show they are still relevant today. Host Clint Eastwood also interviews artists who collaborated with Mercer or performed his songs, including composer John Williams, Blake Edwards, Andre Previn, Tony Bennett, and Julie Andrews.
| Actor | Role |
|---|---|
 Johnny MercerSelf (archive footage) | Self (archive footage) |
| BBill CharlapSelf - Narrator (voice) | Self - Narrator (voice) |
 Clint EastwoodSelf - Host | Self - Host |
 John WilliamsSelf / Performer | Self / Performer |
 Leonard MaltinSelf | Self |
 Tony BennettSelf - Performer | Self - Performer |
| MMorgan EastwoodSelf - Performer | Self - Performer |
 Julie AndrewsSelf | Self |
| KKen BarnesSelf | Self |
 Dr. JohnSelf - Performer | Self - Performer |
| SStephen HoldenSelf | Self |
| NNancy GerardSelf | Self |
| JJonathan SchwartzSelf | Self |
 Ronald HarwoodSelf | Self |
| RRobert KimballSelf | Self |
 Alan BergmanSelf | Self |
| MMaude MaggartSelf - Performer | Self - Performer |
| GGene LeesSelf | Self |
| MMichael FeinsteinSelf | Self |
 Cleo LaineSelf | Self |
 Bucky PizzarelliSelf - Performer | Self - Performer |
| JJean BachSelf | Self |
 John DankworthSelf | Self |
 Jamie CullumSelf - Performer | Self - Performer |
 André PrevinSelf | Self |
| MMandy MercerSelf | Self |
| MMargaret WhitingSelf | Self |
| MMiles KreugerSelf | Self |
 Audra McDonaldSelf - Performer | Self - Performer |
| JJoe HarrisSelf | Self |