A young Irishwoman comes to the United States to live and work with her mother as a cleaning lady at Carnegie Hall. She becomes attached to the place as the people she meets there gradually shape her life. The film also includes a variety of performances from some of the foremost musical artists of the times: conductors Bruno Walter & Leopold Stokowski, solists Arthur Rubinstein & Jascha Haifetz, singers Lily Pons & Jan Peerce and bandleader Vaughn Monroe among many others.
| Actor | Role |
|---|---|
 Marsha HuntNora Ryan | Nora Ryan |
 William PrinceTony Salerno Jr. | Tony Salerno Jr. |
 Frank McHughJohn Donovan | John Donovan |
 Martha O'DriscollRuth Haines | Ruth Haines |
 Hans JárayTony Salerno Sr. | Tony Salerno Sr. |
 Olin DownesOlin Downes | Olin Downes |
 Joseph BuloffAnton Tribik | Anton Tribik |
 Walter DamroschWalter Damrosch | Walter Damrosch |
 Bruno WalterBruno Walter | Bruno Walter |
 Lily PonsLily Pons | Lily Pons |
| GGregor PiatigorskyGregor Piatigorsky | Gregor Piatigorsky |
 Risë StevensRisë Stevens | Risë Stevens |
| AArtur RodzinskiArtur Rodzinski | Artur Rodzinski |
 Arthur RubinsteinArthur Rubinstein | Arthur Rubinstein |
| JJan PeerceJan Peerce | Jan Peerce |
 Ezio PinzaEzio Pinza | Ezio Pinza |
 Jascha HeifetzJascha Heifetz | Jascha Heifetz |
 Fritz ReinerFritz Reiner | Fritz Reiner |
 Vaughn MonroeVaughn Monroe | Vaughn Monroe |
 Leopold StokowskiLeopold Stokowski | Leopold Stokowski |
 Harry JamesHarry James | Harry James |
| EEmile BoreoHenry | Henry |
 Eole GalliKatinka | Katinka |