Ben Schnetzer
— Sergiu Celibidache (young adult)
Kate Phillips
— Ioana Celibidache (young adult)
Miranda Richardson
— Ioana Celibidache
Sean Bean
John Malkovich
— Sergiu Celibidache
Ewan Horrocks
— Sergiu Celibidache (teen)
Tamzin Merchant
— Ortancia
Anton Lesser
— Martin Steinke
Charlie Rowe
— Miki
Eric Olaru
— Miki (child)
Olivia Popica
— Sonia
Ava Capatina
— Sonia (child)
Tiberiu Harsan
— Daniel
Orlando James
— Ginel
Alexandru Isarescu
— Ginel (child)
Brendan Howley
— Patrick
Boiangiu Alma
— Ida Haendel
Robert Dölle
— Professor Tiessen
Guido Broscheit
— Doctor Piendl
Charles Nishikawa
— Mr. Tanaka
Jürgen Heimüller
— Wilhelm Furtwangler