Der Freischütz in the context of "Opus number"

Orchestration is the study or practice of writing music for an orchestra (or, more loosely, for any musical ensemble, such as a concert band) or of adapting music composed for another medium for an orchestra. Also called "instrumentation", orchestration is the assignment of different instruments to play the different parts (e.g., melody, bassline, etc.) of a musical work. For example, a work for solo piano could be adapted and orchestrated so that an orchestra could perform the piece, or a concert band piece could be orchestrated for a symphony orchestra.

In classical music, composers have historically orchestrated their own music. Only gradually over the course of music history did orchestration come to be regarded as a separate compositional art and profession in itself. In modern classical music, composers almost invariably orchestrate their own work. Two notable exceptions to this are Ravel's orchestration of Mussorgsky's solo piano work Pictures at an Exhibition and Malcolm Arnold's orchestration of William Walton's String Quartet in A minor, producing the latter's Sonata for Strings.

The Phantom of the Opera (French: Le Fantôme de l'Opéra, pronounced [lə fɑ̃tom də lɔpeʁa]) is a Gothic horror novel by French author Gaston Leroux. It was first published as a serial in Le Gaulois from 23 September 1909 to 8 January 1910, and was released in volume form in late March 1910 by Pierre Lafitte. The novel is partly inspired by historical events at the Paris Opera during the nineteenth century, and by an apocryphal tale concerning the use of a former ballet pupil's skeleton in an 1841 production of Carl Maria von Weber's Der Freischütz. It has been successfully adapted into various stage and film adaptations, most notable of which are the 1925 film depiction featuring Lon Chaney, and Andrew Lloyd Webber's 1986 musical.

The German composer Carl Maria von Weber (1786–1826) is best known for his operas, of which he wrote 10 between 1798 and 1826. His first four exist in various states: Die Macht der Liebe und des Weins (de) (comp. 1798) is completely lost; two fragments survive for Das Waldmädchen (1800); the libretto to Peter Schmoll und seine Nachbarn (1803) is lost; and only three numbers from Rübezahl (comp. 1804–05) survive. Weber's mature operas—Silvana (1810), Abu Hassan (1811), Der Freischütz (1821), Die drei Pintos (comp. 1820–21), Euryanthe (1823), Oberon (1826)—all survive intact; they were all performed within his lifetime, except Die drei Pintos which was posthumously completed by Gustav Mahler. His contributions to the genre were crucial in the development of German Romantische Oper (German Romantic Opera) and its national identity, exhibiting much influence on Richard Wagner. Der Freischütz, his most famous and significant work, remains among the most revered German operas.

After his family moved to Munich in 1798, the 13 year old Weber began study with Johann Nepomuk Kalcher, under whose supervision he wrote his first opera, the Singspiel Die Macht der Liebe und des Weins; the work was never performed. Two years later in Freiburg, he embarked on his second opera, Das Waldmädchen, to a libretto by Carl von Steinsberg, whose traveling company premiered it the same year. The two surviving fragments of the work show little sophistication, although it received moderate success. Weber's next opera, Peter Schmoll und seine Nachbarn, was written in Salzburg under the supervision of Michael Haydn to a libretto by Josef Türk after Carl Gottlob Cramer's popular novel of the same name. Premiered in 1803 in Augsburg, the work did not match the novel's popularity and was subsequently forgotten. In 1804 Weber was appointed Kapellmeister at the Breslau Opera and worked with a libretto by the theatre's director Johann Gottlieb Rhode (after a story by Johann Karl August Musäus), to produce Rübezahl. The work was never performed and the three extant fragments show little improvement in his craft. After his two-year tenure, Weber spent time in modern-day Pokój, Opole Voivodeship and eventually moved to Stuttgart where he began Silvana.

Romantische Oper (German for 'romantic opera') is a genre of early nineteenth-century German opera, developed not from the German Singspiel of the eighteenth-century but from the opéras comiques of the French Revolution. It offered opportunities for an increasingly important role for the orchestra, and greater dramatic possibilities for reminiscence motifs – phrases that are identified with a place, person or idea and which, when re-used in a work, remind the listener of the place, person or idea in question.

Carl Maria von Weber's Der Freischütz (1821) inaugurated the genre, which increasingly became associated with a distinctively German national style, as exemplified by composers such as Heinrich Marschner (e.g. Der Vampyr and Hans Heiling), Albert Lortzing (e.g. Undine) and Louis Spohr. Themes explored included nature, the supernatural, the Middle Ages and popular culture, specifically folklore. Musically, German folk music also served as an inspiration. Spoken dialogue continued to be used between musical numbers.

The Konzertstück in F minor for Piano and Orchestra, Op. 79, J. 282, was written by Carl Maria von Weber. He started work on it in 1815, and completed it on the morning of the premiere of his opera Der Freischütz, 18 June 1821. He premiered it a week later, on 25 June, at his farewell Berlin concert.