Sonata ( /səˈnɑːtə/; Italian: [soˈnaːta], pl. sonate; from Latin and Italian: sonare, "to sound"), in music, literally means a piece played as opposed to a cantata (Latin and Italian cantare, "to sing"), a piece sung. The term, being vague, naturally evolved through the history of music, designating a variety of forms prior to the Classical era. The term took on increasing importance in the Classical period, and by the early 19th century the word came to represent a principle of composing large scale works. It was applied to most instrumental genres and regarded alongside the fugue as one of two fundamental methods of organizing, interpreting and analyzing concert music. Though the musical style of sonatas has changed since the Classical Era, most 20th- and 21st- century sonatas still maintain the same structure.

Glenn Herbert Gould (September 25, 1932 – October 4, 1982) was a Canadian pianist who became one of the best-known and most celebrated classical pianists of the 20th century. He was particularly renowned as an interpreter of the keyboard music of Johann Sebastian Bach. His playing was distinguished by remarkable technical proficiency and capacity to articulate the polyphonic texture of Bach’s music.

Gould rejected most of the standard Romantic piano literature and, after his adolescence, avoided Liszt, Schumann, and Chopin. Although his recordings were dominated by Bach, Gould's oeuvre was diverse, including works by Beethoven, Mozart, Haydn, Brahms, pre-Baroque composers such as Jan Sweelinck, and such 20th-century composers as Paul Hindemith and Arnold Schoenberg. Gould was well known for various eccentricities, from his unorthodox musical interpretations and mannerisms at the keyboard to aspects of his lifestyle and personal behavior. He stopped giving concerts at the age of 31 to concentrate on studio recording and other projects.

Sonata Arctica is a Finnish power metal band from the town of Kemi, originally assembled in 1995. Their later works (most notably The Days of Grays, Unia and a few tracks on Reckoning Night and Winterheart's Guild) contain several elements typical of progressive metal.

The band was founded by Marko Paasikoski, Jani Liimatainen and Tommy Portimo in Kemi at the end of 1995 (Tony Kakko and Pentti Peura joined in early 1996). Originally named Tricky Beans, they played hard rock rather than the power metal with which they grew to fame. During their early career, they recorded three demos which were never sent to any recording label — Friend 'till the End, Agre Pamppers and PeaceMaker.

In 1997 the band changed their name to Tricky Means, and from that point until 1999 their style was thoroughly worked upon and ultimately was drastically changed, acquiring strong emphasis on the keyboard melodies and relying on an easily distinguishable rhythm line maintained both by the bass and the guitar. Vocalist Tony Kakko developed a clean singing style which relies both on falsetto and tenor voices and second guitarist Marko Paasikoski left the band. Kakko has stated that the change of sound was influenced by fellow Finnish power metal band Stratovarius.

Daniel Barenboim, KBE (born 15 November 1942) is an Argentine-born pianist and conductor. He has served as music director of several major symphonic and operatic orchestras and made numerous recordings.

Currently, he is general music director of La Scala in Milan, the Berlin State Opera, and the Staatskapelle Berlin; he previously served as Music Director of the Chicago Symphony Orchestra and the Orchestre de Paris. Barenboim is also known for his work with the West-Eastern Divan Orchestra, a Sevilla-based orchestra of young Arab and Israeli musicians, and as an outspoken critic of the Israeli occupation of Palestinian territories.

Barenboim has received many awards and prizes, including an honorary Knight Commander of the Order of the British Empire, France's Légion d'honneur both as a Commander and Grand Officier, the German Großes Bundesverdienstkreuz and Willy Brandt Award, and, together with the Palestinian-American scholar Edward Said, Spain's Prince of Asturias Concord Award. He has won seven Grammy awards for his work and discography.

Johannes Brahms (pronounced [joːˈhanəs ˈbʁaːms]; 7 May 1833  – 3 April 1897) was a German composer and pianist, and one of the leading musicians of the Romantic period. Born in Hamburg, Brahms spent much of his professional life in Vienna, Austria, where he was a leader of the musical scene. In his lifetime, Brahms's popularity and influence were considerable; following a comment by the nineteenth-century conductor Hans von Bülow, he is sometimes grouped with Johann Sebastian Bach and Ludwig van Beethoven as one of the Three Bs.

Brahms composed for piano, chamber ensembles, symphony orchestra, and for voice and chorus. A virtuoso pianist, he premiered many of his own works; he also worked with some of the leading performers of his time, including the pianist Clara Schumann and the violinist Joseph Joachim. Many of his works have become staples of the modern concert repertoire. Brahms, an uncompromising perfectionist, destroyed many of his works and left some of them unpublished.

Brahms is often considered both a traditionalist and an innovator. His music is firmly rooted in the structures and compositional techniques of the Baroque and Classical masters. He was a master of counterpoint, the complex and highly disciplined art for which Johann Sebastian Bach is famous, and also of development, a compositional ethos pioneered by Joseph Haydn, Wolfgang Amadeus Mozart and Ludwig van Beethoven. Brahms aimed to honour the "purity" of these venerable "German" structures and advance them into a Romantic idiom, in the process creating bold new approaches to harmony and melody. While many contemporaries found his music too academic, his contribution and craftsmanship have been admired by subsequent figures as diverse as Arnold Schoenberg and Edward Elgar. The diligent, highly constructed nature of Brahms's works was a starting point and an inspiration for a generation of composers.