In 1840s Vienna, Johann Strauss I (Nigel Patrick) is conducting an orchestra in a ballroom full of dancers, when he is interrupted by his furious estranged wife Anna (Yvonne Mitchell) who confronts him about the fact that his notorious mistress Emilie (Susan Robinson) is planning to name her new baby son by him with the name Johann, the same as Strauss's legitimate son, Johann Strauss II (Horst Buchholz). After the elder Strauss, as well as the mistress, refuse the wife's demand to change the baby's name, Strauss's wife retaliates by informing the elder Strauss that his son has embarked on a career as a violinist, in direct contradiction to the elder Strauss's wishes, as such a career would consign his son to a life equivalent to a servant. With the initial help of his mother, and through his talent and cleverness, the younger Strauss is able to find a position in an orchestra. At his debut as a conductor, he is roundly booed by a hostile audience, led by friends of his father. He persists on stage, however, playing one of his own compositions on violin, while leading the orchestra. His determination wins over the audience with great acclaim. Upon hearing the news of his son's success, the elder Strauss listens in on one of his performances, and hearing his son's words of tribute to him, he is moved to tears, and is won over to his son's career and ambition. Shortly afterwards, the elder Strauss dies of scarlet fever, and the younger Strauss is given the position of leading his father's orchestra. By the time he reaches age 37, Strauss has achieved enormous success, and along the way has had numerous frivolous affairs with women, all while remaining single, leading his friends and his mother to be concerned for his well-being. At one of his performances, his catches the eye of Jetty Treffz (Mary Costa), who is the mistress of Baron Tedesco (Rossano Brazzi), and seven years older than him. At a subsequent dinner, he is invited to dine with Jetty and the baron. The two of them dance together to Strauss's orchestra, and begin to fall in love. Strauss invites Jetty and the baron to a concert, at which Jetty is to sing. The baron, sensing Jetty's interest in Strauss, attempts to scuttle the plans with a sudden business trip, but Jetty insists on delaying her own departure, in order to fulfill her promise to sing. After the concert, Strauss expresses his feelings of love to Jetty, and invites to perform with him for the Emperor. Jetty at first flees from him, but then cancels her plans to join the baron on his trip, and instead joins Strauss at his performance, singing for Franz Joseph, while Strauss accompanies her on the violin. Despite the warnings of the insistent Baron concerning her age, and Strauss's reputation with women, Jetty leaves the heartbroken Baron and marries Strauss. Strauss's mother is unwelcoming of the idea, but after a visit by the Baron, who seeks to aid Jetty's happiness in her marriage, the mother's heart melts, and she rushes to the church in time to congratulate her son and his new bride. With Jetty by his side, Strauss achieves the pinnacle of fame, playing in the finest concert halls. He also embarks on the most productive time of his career, composing some of his most well-known pieces, including The Blue Danube, which he presents to a disastrous debut by his insistence on using inferior and sarcastic lyrics, against the tearful protestations of Jetty. Strauss is then invited to perform at the Paris Exposition of 1867, which he considers an incredible opportunity. Strauss's mother is overjoyed until Jetty confides to her a secret that she has a grown son who lives in Paris, and who will probably blackmail her.

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• classical-composer
• vienna-austria
• father-son-rivalry
• singing-narrator
• domineering-mother
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