Question: Wilhelm von Lenz, was a Baltic German Russian official and writer, and was a friend of many mid-century Romantic composers, including Hector Berlioz, that died on which date, was a French Romantic composer, best known for his compositions "Symphonie fantastique" and "Grande messe des morts" (Requiem)?
Context: Wilhelm von Lenz (born 20 May 1809 in Riga - died 7 January 1883 in Saint Petersburg) was a Baltic German Russian official and writer.  Wilhelm von Lenz was a friend of many mid-century Romantic composers, including Franz Liszt, Frédéric Chopin and Hector Berlioz, Lenz's most important and influential work was an early biography of the German composer Ludwig van Beethoven, entitled "Beethoven et ses trois styles" (1855), written in response to the disparagement of Beethoven by Alexander Ulybyshev in his "Nouvelle biographie de Mozart" (1843).  Lenz promoted the idea (already suggested by earlier figures such as François-Joseph Fétis) that Beethoven's musical style be divided into three characteristic periods.  Lenz's periodisation, with minor changes, is still widely used today by musicologists in discussing Beethoven's compositions. Symphonie fantastique: Épisode de la vie d'un artiste ... en cinq parties ("Fantastical Symphony: An Episode in the Life of an Artist, in Five Parts") Op.  14, is a program symphony written by the French composer Hector Berlioz in 1830.  It is an important piece of the early Romantic period.  The first performance was at the Paris Conservatoire in December 1830.  Franz Liszt made a piano transcription of the symphony in 1833 (S. 470). Program music or programme music is a type of art music that attempts to musically render an extra-musical narrative.  The narrative itself might be offered to the audience in the form of program notes, inviting imaginative correlations with the music.  A classic example is Hector Berlioz's "Symphonie fantastique", which relates a drug-induced series of morbid fantasies concerning the unrequited love of a sensitive poet involving murder, execution, and the torments of Hell.  The genre culminates in the symphonic works of Richard Strauss that include narrations of the adventures of "Don Quixote", "TillEulenspiegel", the composer's domestic life, and an interpretation of Nietzsche's philosophy of the Superman.  Following Strauss, the genre declined and new works with explicitly narrative content are rare.  Nevertheless the genre continues to exert an influence on film music, especially where this draws upon the techniques of late romantic music. The Grande Messe des morts (or Requiem), Op.  5, by Hector Berlioz was composed in 1837.  The "Grande Messe des Morts" is one of Berlioz's best-known works, with a tremendous orchestration of woodwind and brass instruments, including four antiphonal offstage brass ensembles placed at the corners of the concert stage.  The work derives its text from the traditional Latin Requiem Mass.  It has a duration of approximately ninety minutes, although there are faster recordings of under seventy-five minutes. Louis-Hector Berlioz (] (English: ); 11 December 1803 – 8 March 1869) was a French Romantic composer, best known for his compositions "Symphonie fantastique" and "Grande messe des morts" (Requiem).  Berlioz made significant contributions to the modern orchestra with his "Treatise on Instrumentation".  He specified huge orchestral forces for some of his works, and conducted several concerts with more than 1,000 musicians.  He also composed around 50 songs.  His influence was critical for the further development of Romanticism, especially in composers like Richard Wagner, Nikolai Rimsky-Korsakov, Franz Liszt, Richard Strauss, and Gustav Mahler. The Te Deum (Op. 22 / H.118) by Hector Berlioz (1803–1869) was completed in 1849.  Like the earlier and more famous ""Grande Messe des Morts"", it is one of the works referred to by Berlioz in his Memoirs as "the enormous compositions which some critics have called architectural or monumental music."  While the orchestral forces required for the "Te Deum" are not as titanic as those of the "Requiem", the work calls for an organ that can compete on equal terms with the rest of the orchestra.  It lasts approximately fifty minutes and derives its text from the traditional Latin Te Deum, although Berlioz changed the word order for dramatic purposes. The Mémoires de Hector Berlioz are an autobiography by French composer Hector Berlioz.  First serialised in several contemporary journals including "Journal des Débats" and "Le Monde Illustré", their compilation into one book was completed on New Year's Day, 1865 and after much proof-reading, an initial printing of 1200 was carried out in July.  After distributing some copies to certain friends, they were put aside until Berlioz died.  After Berlioz's death in 1869, they were published in 1870.  They provide an extremely colourful, if biased, account of Berlioz's life, and are invaluable to anyone with an interest in the artistic life of the time. La Symphonie fantastique is a 1942 French drama film by Christian-Jaque and produced by the German-controlled French film production company Continental Films.  The film is based upon the life of the French composer Hector Berlioz.  The title is taken from the five-movement programmatic "Symphonie fantastique" of 1830.  The film lasts around 90 minutes and was first shown at the 'Normandie' cinema in Paris on 1 April 1942.  The posters at the premiere contained the sub-title 'La Vie passionnée et glorieuse d'un génie' (which links with the quote from Hugo at the very end of the film). Lélio, ou Le retour à la vie (English: "Lélio, or the Return to Life") Op. 14b, is a work incorporating music and spoken text by the French composer Hector Berlioz, intended as a sequel to his "Symphonie fantastique".  It is written for a narrator, solo voices, chorus, and an orchestra including pianos. Butte Des Morts (in French, hill of the dead) is a region of northeastern Wisconsin, in Winnebago County, containing two known lakes: Little Lake Butte des Morts, and Lake Butte des Morts.  Little Lake Butte des Morts lies between the Menasha region from the town of Menasha, while Big Lake Butte des Morts lies in the northwest side of the city of Oshkosh, Wisconsin.
Answer: 8 March 1869