En 1777, après une dispute avec le Prince-archevêque de Salzbourg Hieronymus von Colloredo-Mannsfeld, Mozart part avec sa mère pour Paris. Pendant le voyage, il persuade sa mère de s'arrêter à Mannheim pour voir Aloysia Weber dont il est amoureux. Après avoir chanté une chanson composée par Mozart, elle a obtenu un emploi à la cour royale. À contrecœur Mozart se rend à Paris. Mais en France, il ne retrouve pas le succès qu'il a connu comme enfant prodige. De plus, sa mère meurt à Paris. Il retourne donc à Salzbourg.
The film is biographical, telling the story of the life and artistic struggles of the French composer Hector Berlioz. Berlioz is shown as a recalcitrant medical student in an anatomy class dreaming of becoming a composer; at a demonstration during a performance at the Paris Opéra conducted by Habeneck; at supper with other young artists (Hugo, Janin, Dumas, Mérimée, Delacroix); and chasing after his future wife Harriet Smithson, after a performance of Hamlet. Also depicted are his life in a garret, while suffering from an illness due to an abscess in the throat; a visit from his mother who curses him; and the composition of the Symphonie fantastique. The film then shows his marital breakdown, the premiere of his opera Benvenuto Cellini, his travels throughout Europe, his second marriage to Marie Recio (called "Marie Martin" in the film), public acceptance in old age and reconciliation with his son.
During the German invasion of Poland, Polish airman and piano virtuoso, Stefan Radetzky (Anton Walbrook) meets American reporter Carole Peters (Sally Gray). He volunteers to fly a "suicide mission" against Germany, but is not selected. Radetzky is among the last to escape Warsaw and months later, in New York, he and Carole meet again, and marry.
During a house concert, the Bach family gets a visit by their son Wilhelm Friedemann, who has just given up his position in Dresden because he no longer could endure the reprisals of his superiors. After he helps his sister Frederike to tell father Johann Sebastian about her
Eddie Crane, a young composer, is struggling with a tune he has just written. When his girlfriend, Dixie Donegan, provides words almost by accident, the song is published and is a great success.
Le film est composé de sept séquences illustrant huit morceaux de musique classique, réorchestrés et dirigés par le chef d'orchestre Leopold Stokowski à la tête de l'Orchestre de Philadelphie. La dernière séquence illustre deux morceaux et un intermède sépare la séquence 4 et 5. Chaque séquence est précédée d'une courte introduction où l'orchestre est en ombre chinoise.
Moscou, en 1865. La chanteuse Katherina Mourakine, mal mariée, retrouve le compositeur Piotr Ilitch Tchaïkovski, son amour d'antan. Celui-ci sollicite son aide financière, ce à quoi elle consent sous le sceau du secret...
Holger Brandt, a famous virtuoso violinist, meets Anita Hoffman, his daughter's piano instructor, during a trip home. Impressed by Anita's talent, he invites her to accompany him on his next tour. They begin touring together and a passionate relationship ensues. Holger's wife Margit asks him for a divorce.