Mozart in the context of "Number opera"

Musical improvisation (also known as musical extemporization) is the creative activity of immediate ("in the moment") musical composition, which combines performance with communication of emotions and instrumental technique as well as spontaneous response to other musicians. Sometimes musical ideas in improvisation are spontaneous, but may be based on chord changes in classical music and many other kinds of music. One definition is a "performance given extempore without planning or preparation". Another definition is to "play or sing (music) extemporaneously, by inventing variations on a melody or creating new melodies, rhythms and harmonies". Encyclopædia Britannica defines it as "the extemporaneous composition or free performance of a musical passage, usually in a manner conforming to certain stylistic norms but unfettered by the prescriptive features of a specific musical text." Improvisation is often done within (or based on) a pre-existing harmonic framework or chord progression. Improvisation is a major part of some types of 20th-century music, such as blues, rock music, jazz, and jazz fusion, in which instrumental performers improvise solos, melody lines and accompaniment parts.

Throughout the eras of the Western art music tradition, including the Medieval, Renaissance, Baroque, Classical, and Romantic periods, improvisation was a valued skill. J. S. Bach, Handel, Mozart, Beethoven, Chopin, Liszt, and many other famous composers and musicians were known especially for their improvisational skills. Improvisation might have played an important role in the monophonic period. The earliest treatises on polyphony, such as the Musica enchiriadis (ninth century), indicate that added parts were improvised for centuries before the first notated examples. However, it was only in the fifteenth century that theorists began making a hard distinction between improvised and written music.

The rondo or rondeau is a musical form that contains a principal theme (sometimes called the "refrain") which alternates with one or more contrasting themes (generally called "episodes", but also referred to as "digressions" or "couplets"). Some possible patterns include: ABACA, ABACAB, ABACBA, or ABACABA (with the letter 'A' representing the refrain).

The rondo form emerged in the Baroque period and became increasingly popular during the Classical period. The earliest examples of compositions employing rondo form are found within Italian operatic arias and choruses from the first years of the 17th century. These examples use a multi-couplet rondo or "chain rondo" (ABACAD) known as the Italian rondo. Rondo form, also known in English by its French spelling rondeau, should not be confused with the unrelated but similarly-named forme fixe rondeau, a 14th- and 15th-century French poetic and chanson form.

Don Juan (Spanish: [doŋ ˈxwan]), also known as Don Giovanni (Italian), is a legendary fictional Spanish libertine who devotes his life to seducing women.

The original version of the story of Don Juan appears in the 1630 play El burlador de Sevilla y convidado de piedra (The Trickster of Seville and the Stone Guest) by Tirso de Molina. The play includes most of the elements found and later adapted in subsequent works, including the setting (Seville), the characters (Don Juan, his servant, his love interest, and her father, whom he kills), moralistic themes (honor, violence and seduction, vice and retribution), and the dramatic ending in which Don Juan dines with and is then dragged down to hell by the stone statue of the father he had previously slain. Tirso de Molina's play was subsequently adapted into numerous plays and poems, of which the most famous include a 1665 play, Dom Juan, by Molière; a 1787 opera, Don Giovanni, with music by Mozart and a libretto by Lorenzo da Ponte largely adapting Tirso de Molina's play; a satirical and epic poem, Don Juan, by Lord Byron; and Don Juan Tenorio, a romantic play by José Zorrilla.

Robert Bresson (French: [ʁɔbɛʁ bʁɛsɔ̃]; 25 September 1901 – 18 December 1999) was a French filmmaker. Known for his ascetic approach, Bresson made a notable contribution to the art of cinema; his non-professional actors, ellipses, and sparse use of scoring have led his works to be regarded as preeminent examples of minimalist film. Much of his work is known for being tragic in story and nature.

Bresson is among the most highly regarded filmmakers of all time. He has the highest number of films (seven) that made the 2012 Sight and Sound critics' poll of the Greatest Films of All Time. His works A Man Escaped (1956), Pickpocket (1959) and Au hasard Balthazar (1966) were ranked among the top 100, and other films like Mouchette (1967) and L'Argent (1983) also received many votes. Jean-Luc Godard once wrote, "He is the French cinema, as Dostoevsky is the Russian novel and Mozart is German music."

Literally 'song' in Italian, a canzone (Italian: [kanˈtsoːne]; pl.: canzoni; cognate with English to chant) is an Italian or Provençal song or ballad. It is also used to describe a type of lyric which resembles a madrigal. Sometimes a composition which is simple and songlike is designated as a canzone, especially if it is by a non-Italian; a good example is the aria "Voi che sapete" from Mozart's Marriage of Figaro.

The term canzone is also used interchangeably with canzona, an important Italian instrumental form of the late 16th and early 17th century. Often works designated as such are canzoni da sonar; these pieces are an important precursor to the sonata. Terminology was lax in the late Renaissance and early Baroque music periods, and what one composer might call "canzoni da sonar" might be termed "canzona" by another, or even "fantasia". In the work of some composers, such as Paolo Quagliati, the terms seem to have had no formal implication at all.

A fortepiano [ˌfɔrteˈpjaːno] is an early piano. In principle, the word "fortepiano" can designate any piano dating from the invention of the instrument by Bartolomeo Cristofori in 1700 up to the early 19th century. Most typically, however, it is used to refer to the mid-18th to early-19th century instruments, for which composers of the Classical era, such as Haydn, Mozart, and the younger Beethoven and Schubert, wrote their piano music.

Starting in Beethoven's time, the fortepiano began a period of steady evolution, culminating in the late 19th century with the modern grand. The earlier fortepiano became obsolete and was absent from the musical scene for many decades. In the later 20th century, the fortepiano was revived, following the rise of interest in historically informed performance. Fortepianos are built for that purpose, in specialist workshops.

Franz Anton Mesmer (/ˈmɛzmər/ MEZ-mər; German: [ˈmɛsmɐ]; 23 May 1734 – 5 March 1815) was a German physician with an interest in astronomy. He theorized the existence of a process of natural energy transference occurring between all animate and inanimate objects; this he called "animal magnetism", later referred to as mesmerism. Mesmer's theory attracted a wide following between about 1780 and 1850, and continued to have some influence until the end of the 19th century. In 1843, the Scottish doctor James Braid proposed the term "hypnotism" for a technique derived from animal magnetism; today the word "mesmerism" generally functions as a synonym of "hypnosis". Mesmer also supported the arts, specifically music; he was on friendly terms with Haydn and Mozart.