Back in Paris, he set about conquering it anew. He put together a collection of earlier pieces in a form then fashionable, the monodrama, or recitation by one actor interspersed with musical scenes. Since the Symphonie fantastique had ended with the death and demonic torments of the protagonist, Berlioz called his new work Le Retour à la vie (later Lélio, after the hero’s name). First performed in 1832, this concoction, which contains three or four delightful pieces, enjoyed great success, and Berlioz had reason to think himself launched again.

A series of accidents brought him in touch with the actress Harriet Smithson, whom he married on October 3, 1833. The marriage did not last, though for some years the couple led a peaceful existence at Montmartre in the house that Maurice Utrillo later never tired of painting. Among the visitors there were the young poets and musicians of the Romantic movement, including Alfred de Vigny and Chopin. It was there that Berlioz’s only child, Louis, was born and also where he composed his great Requiem, the Grande Messe des morts (1837), the symphonies Harold en Italie (1834) and Roméo et Juliette (1839), and the opera Benvenuto Cellini (Paris, 1838).

It was after the premiere of Harold en Italie that Berlioz had the astonishing experience of seeing the famous violin virtuoso Paganini fall at his feet and declare that he was a genius destined to carry on the new musical tradition initiated by Beethoven. The next day Berlioz received 20,000 francs with a letter from Paganini repeating this judgment. Using the money to free himself from journalistic drudgery, Berlioz composed the choral symphony Roméo et Juliette, dedicated to Paganini.

In Paris it was always expected that a composer, regardless of his bent, should be tested at the Opéra. Berlioz’s friends intrigued to procure the assignment of a libretto. An adaptation of Benvenuto Cellini’s autobiography was secured, and Berlioz finished his score in a short time. The intrigue now passed to the other side, which saw to it that the production of Benvenuto Cellini at the Opéra failed. From this blow the work itself and the composer’s reputation in France never recovered during his lifetime. The score is a masterpiece, and the attribution of the failure to the libretto shows ignorance of the qualities of both the libretto and the music.

The Requiem of 1837 had been a government commission for a ceremonial occasion designed to encourage the Rome laureate. The request to compose another work for a public ceremony—the Symphonie funèbre et triomphale (Funeral Symphony) for military band, chorus, and strings, commissioned for the 10th anniversary (1840) of the July Revolution of 1830—was intended as a partial solace for the defeat of Benvenuto Cellini. A few years before, Berlioz’s literary gifts had won him the post of music critic for the leading Paris newspaper, the Journal des Débats, and his employers wielded political influence. Once again, there were intrigues, but the score of the Funeral Symphony was ready for the inauguration of the commemorative July Column in the Place de la Bastille. Unfortunately, the music was drowned out by the drum corps, a disaster that Berlioz repaired by giving the work the following month at a concert hall. This was the score that Wagner, then seeking fame in Paris, admired so wholeheartedly.

Berlioz was able to put Wagner in the way of some musical journalism and thus began a fitful connection of 30 years between the two men whose influence on modern music still resembles a battle of ideals: Berlioz aiming at the creation of drama in and through music alone; Wagner at marriage of symphony with opera. Although Berlioz and Wagner met again in London in 1855 and found each other congenial, their philosophical differences generally kept them apart.

After 1840 Berlioz’s life consisted of a series of tours across Europe. The last of these was an exhausting series of concerts in St. Petersburg and Moscow in 1867, when he was desperately ill. But it had the effect of introducing the Russian Five, notably Mussorgsky, to his style through his manuscript scores and his conducting. For Berlioz was the first of the virtuoso conductors, having made himself such in order to supply the deficiencies of men who were unable to direct the new music according to the new canon: play what is written. Moreover, the rhythmical difficulties of his scores and the unfamiliar curve of his melodies disconcerted many. The orchestras themselves had to be taught a new precision, vigour, and ensemble, and this was Berlioz’s handiwork. Wagner’s memoirs bear testimony to this “revelation of a new world,” which he experienced at Berlioz’s hands in 1839.

On orchestration itself (and, even more important, on instrumentation) Berlioz produced the leading treatise, Traité d’instrumentation et d’orchestration modernes (1844). Much more than a technical handbook, it served later generations as an introduction to the aesthetics of expressiveness in music. As Albert Schweitzer has shown, its principle is as applicable to Bach as to Berlioz, and it is in no way governed by considerations of so-called program music. To this last-named genre of dubious repute, Berlioz did not contribute more than the printed “story” of his first symphony, which is intelligible as music, without any program.

Among Berlioz’s dramatic works, two became internationally known: La Damnation de Faust (1846) and L’Enfance du Christ (1854). Two others began to emerge from neglect after World War I: the massive two-part drama Les Troyens (1855–58), based on Virgil’s story of Dido and Aeneas, and the short, witty comedy Béatrice et Bénédict, written between 1860 and 1862 and based on Shakespeare’s Much Ado About Nothing. For all these Berlioz wrote his own librettos. He also wrote a Te Deum (1849; perfomed 1855), which is a fitting counterpart to the Requiem, and between 1843 and 1856 he orchestrated his songs, including the song cycle Les Nuits d’été (Summer Nights). Among his best known overtures are Le Roi Lear (1831), Le Carnaval romain (1844), based on material from Benvenuto Cellini, and Le Corsaire (1831–52).

In Berlioz’s final years he was incapacitated by illness and saddened by many deaths. His first wife, from whom he was separated but to whom he still felt a deep attachment, died in 1854; his second wife, Maria Recio, who had been his companion for many years and whom he had married when he became a widower, died suddenly in 1862. Finally, his son, Louis, who was a sea captain and on whom he concentrated the affection of his declining years, died of yellow fever in Havana at the age of 33.