Richard Wagner in the context of "Operas"

Friedrich Wilhelm Nietzsche (15 October 1844 – 25 August 1900) was a German philosopher. He began his career as a classical philologist, turning to philosophy early in his academic career. In 1869, aged 24, Nietzsche became the youngest professor to hold the Chair of Classical Philology at the University of Basel. Plagued by health problems for most of his life, he resigned from the university in 1879, and in the following decade he completed much of his core writing. In 1889, aged 44, he suffered a collapse and thereafter a complete loss of his mental faculties, with paralysis and vascular dementia, living his remaining 11 years under the care of his family until his death. His works and his philosophy have fostered not only extensive scholarship but also much popular interest.

Nietzsche's work encompasses philosophical polemics, poetry, cultural criticism and fiction, while displaying a fondness for aphorisms and irony. Prominent elements of his philosophy include his radical critique of truth in favour of perspectivism; a genealogical critique of religion and Christian morality and a related theory of master–slave morality; the aesthetic affirmation of life in response to both the "death of God" and the profound crisis of nihilism; the notion of Apollonian and Dionysian forces; and a characterisation of the human subject as the expression of competing wills, collectively understood as the will to power. He also developed influential concepts such as the Übermensch and his doctrine of eternal return. In his later work he became increasingly preoccupied with the creative powers of the individual to overcome cultural and moral mores in pursuit of new values and aesthetic health. His body of work touched a wide range of topics, including art, philology, history, music, religion, tragedy, culture and science, and drew inspiration from Hebrew literature, Indian literature and Greek tragedy, as well as figures such as Zoroaster, Arthur Schopenhauer, Ralph Waldo Emerson, Richard Wagner, Fyodor Dostoevsky and Johann Wolfgang von Goethe.

In folklore, giants (from Ancient Greek: gigas, cognate giga-) are beings of humanoid appearance, but are at times prodigious in size and strength or bear an otherwise notable appearance. The word giant is first attested in 1297 from Robert of Gloucester's chronicle. It is derived from the Gigantes (Ancient Greek: Γίγαντες) of Greek mythology.

Fairy tales such as Jack the Giant Killer have formed the modern perception of giants as dimwitted and violent ogres, sometimes said to eat humans, while other giants tend to eat livestock. In more recent portrayals, like those of Jonathan Swift and Roald Dahl, some giants are both intelligent and friendly.

A wide range of movements existed in the theatrical culture of Europe and the United States in the 19th century. In the West, they include Romanticism, melodrama, the well-made plays of Scribe and Sardou, the farces of Feydeau, the problem plays of Naturalism and Realism, Wagner's operatic Gesamtkunstwerk, Gilbert and Sullivan's plays and operas, Wilde's drawing-room comedies, Symbolism, and proto-Expressionism in the late works of August Strindberg and Henrik Ibsen.

In music, an arrangement is a musical adaptation of an existing composition. Differences from the original composition may include reharmonization, melodic paraphrasing, orchestration, or formal development. Arranging differs from orchestration in that the latter process is limited to the assignment of notes to instruments for performance by an orchestra, concert band, or other musical ensemble. Arranging "involves adding compositional techniques, such as new thematic material for introductions, transitions, or modulations, and endings. Arranging is the art of giving an existing melody musical variety". In jazz, a memorized (unwritten) arrangement of a new or pre-existing composition is known as a head arrangement.

Nikolai Andreyevich Rimsky-Korsakov (18 March 1844 – 21 June 1908) was a Russian composer, a member of the group of composers known as The Five. His best-known orchestral compositions—Capriccio Espagnol, the Russian Easter Festival Overture, and the symphonic suite Scheherazade—are staples of the classical music repertoire, along with suites and excerpts from some of his fifteen operas. Scheherazade is an example of his frequent use of fairy-tale and folk subjects.

Rimsky-Korsakov believed in developing a nationalistic style of classical music, employing Russian folk song and lore along with exotic harmonic, melodic and rhythmic elements in a practice known as musical orientalism, and eschewing traditional Western compositional methods. Rimsky-Korsakov appreciated Western musical techniques after he became a professor of musical composition, harmony, and orchestration at the Saint Petersburg Conservatory in 1871. He undertook a rigorous three-year program of self-education and became a master of Western methods, incorporating them alongside the influences of Mikhail Glinka and fellow members of The Five. Rimsky-Korsakov's techniques of composition and orchestration were further enriched by his exposure to the works of Richard Wagner.

Gottfried Semper (German: [ˈɡɔtfʁiːt ˈzɛmpɐ]; 29 November 1803 – 15 May 1879) was a German architect, art critic, and professor of architecture who designed and built the Semper Opera House in Dresden between 1838 and 1841. In 1849 he took part in the May Uprising in Dresden and was put on the government's wanted list. He fled first to Zürich and later to London. He returned to Germany after the 1862 amnesty granted to the revolutionaries.

Semper wrote extensively on the origins of architecture, especially in his book The Four Elements of Architecture (1851), and was one of the major figures in the controversy surrounding the polychrome architectural style of ancient Greece. He designed works at all scales—from major urban interventions such as the redesign of the Ringstraße in Vienna, to a baton for Richard Wagner. His unrealised design for an opera house in Munich was, without permission, adapted by Wagner for the Bayreuth Festspielhaus.

A leitmotif or Leitmotiv (/ˌlaɪtmoʊˈtiːf/) is a "short, recurring musical phrase" associated with a particular person, place, or idea. It is closely related to the musical concepts of idée fixe or motto-theme. The spelling leitmotif is a partial anglicization of the German Leitmotiv (IPA: [ˈlaɪtmoˌtiːf] ), literally meaning "leading motif", or "guiding motif". A musical motif has been defined as a "short musical idea ... melodic, harmonic, or rhythmic, or all three", a salient recurring figure, musical fragment or succession of notes that has some special importance in or is characteristic of a composition: "the smallest structural unit possessing thematic identity".

In particular, such a motif should be "clearly identified so as to retain its identity if modified on subsequent appearances" whether such modification be in terms of rhythm, harmony, orchestration or accompaniment. It may also be "combined with other leitmotifs to suggest a new dramatic condition" or development. The technique is notably associated with the operas of Richard Wagner, and most especially his Der Ring des Nibelungen, although he was not its originator and did not employ the word in connection with his work.

Das Rheingold (pronunciation; The Rhinegold), WWV 86A, is the first of the four epic music dramas that constitute Richard Wagner's cycle Der Ring des Nibelungen (English: The Ring of the Nibelung). It premiered as a single opera at the National Theatre of Munich on 22 September 1869, and received its first performance as part of the Ring cycle at the Bayreuth Festspielhaus on 13 August 1876.

Wagner wrote the Ring librettos in reverse order, so that Das Rheingold was the last of the texts to be written; it was, however, the first to be set to music. The score was completed in 1854, but Wagner was unwilling to sanction its performance until the whole cycle was complete; he worked intermittently on this music until 1874. The 1869 Munich premiere of Das Rheingold was staged, against Wagner's wishes, on the orders of King Ludwig II of Bavaria, his patron. Following its 1876 Bayreuth premiere, the Ring cycle was introduced into the worldwide repertory, with performances in all the main opera houses, in which it has remained a regular and popular fixture.