A symphony is an extended musical composition in Western classical music, scored almost always for orchestra. A symphony usually contains at least one movement or episode composed according to the sonata principle. Many symphonies are tonal works in four movements with the first in sonata form, which is often described by music theorists as the structure of a "classical" symphony, although many symphonies by the acknowledged classical masters of the form, Joseph Haydn, Wolfgang Amadeus Mozart, and Ludwig van Beethoven do not conform to this model.

Claudio Abbado, Cavaliere di Gran Croce OMRI (Italian pronunciation: [ˈklaudio abˈbaːdo]; born June 26, 1933), is an Italian conductor. He has served as music director of the La Scala opera house in Milan, principal conductor of the London Symphony Orchestra, principal guest conductor of the Chicago Symphony Orchestra, music director of the Vienna State Opera, and principal conductor of the Berlin Philharmonic orchestra from 1989 to 2002, when he retired from the position for health reasons.

Born in Milan, Italy, Abbado is the son of the violinist and composer Michelangelo Abbado, who was his first piano teacher, and the brother of musician Marcello Abbado. After studying piano at the Milan Conservatory, in 1955 Claudio Abbado studied conducting with Hans Swarowsky at the Vienna Academy of Music. In 1958 he won the international Koussevitsky Competition for conductors, which resulted in a number of operatic conducting engagements in Italy, and in 1963 he won the Dimitri Mitropoulos Prize for conductors, allowing him to work for five months with the New York Philharmonic.

The Chicago Symphony Orchestra (CSO) is an American orchestra based in Chicago, Illinois. It is one of the five American orchestras commonly referred to as the "Big Five". Founded in 1891, the Symphony makes its home at Orchestra Hall in Chicago and plays a summer season at the Ravinia Festival. The music director is Riccardo Muti, who began his tenure in 2010.

In 1891 Charles Norman Fay, a Chicago businessman, invited Theodore Thomas to establish an orchestra in Chicago. Conducted by Theodore Thomas under the name "Chicago Orchestra", the Orchestra played its first concert on October 16, 1891 at the Auditorium Theatre. It is one of the oldest orchestras in the United States, along with the New York Philharmonic, the Boston Symphony Orchestra and the Saint Louis Symphony Orchestra.

Orchestra Hall, now a component of the Symphony Center complex, was designed by Chicago architect Daniel H. Burnham and completed in 1904. Maestro Thomas served as music director for thirteen years until his death shortly after the orchestra's newly built residence was dedicated on December 14, 1904. The orchestra was renamed "Theodore Thomas Orchestra" in 1905 and today, Orchestra Hall still has "Theodore Thomas Orchestra Hall" inscribed in its façade.

Gustav Mahler (German pronunciation: [ˈɡʊstaf ˈmaːlɐ]; 7 July 1860 – 18 May 1911) was a late-Romantic Austrian composer and one of the leading conductors of his generation. He was born in the village of Kalischt, Bohemia, in what was then the Austrian Empire, now Kaliště in the Czech Republic. Then his family moved to nearby Iglau (now Jihlava) where Mahler grew up.

As a composer, he acted as a bridge between the 19th century Austro-German tradition and the modernism of the early 20th century. While in his lifetime his status as a conductor was established beyond question, his own music gained wide popularity only after periods of relative neglect which included a ban on its performance in much of Europe during the Nazi era. After 1945 the music was discovered and championed by a new generation of listeners; Mahler then became one of the most frequently performed and recorded of all composers, a position he has sustained into the 21st century.

Born in humble circumstances, Mahler displayed his musical gifts at an early age. After graduating from the Vienna Conservatory in 1878, he held a succession of conducting posts of rising importance in the opera houses of Europe, culminating in his appointment in 1897 as director of the Vienna Court Opera (Hofoper). During his ten years in Vienna, Mahler—who had converted to Catholicism from Judaism to secure the post—experienced regular opposition and hostility from the anti-Semitic press. Nevertheless, his innovative productions and insistence on the highest performance standards ensured his reputation as one of the greatest of opera conductors, particularly as an interpreter of the stage works of Wagner and Mozart. Late in his life he was briefly director of New York's Metropolitan Opera and the New York Philharmonic.

Floor Jansen (pronounced [flɔr ˈjɑnsɛn]; born 21 February 1981, Goirle) is a Dutch soprano singer, who was the lead singer of the symphonic metal band After Forever which disbanded in 2009, and is the current singer for ReVamp.

Jansen was sixteen when she joined Apocalypse (the name of the band After Forever in its early days) in 1997. Three years later the band released its first album, Prison Of Desire. Floor's ability to sing both classical and rock music have made her reasonably popular in the metal scene. She took sole charge of After Forever's lyrics and vocal melodies since the departure of Mark Jansen (no relation) in 2002. Prior to this, up until the Decipher album, the two would write together.

Floor started studying music at the Dutch Rock Academy in 1999 and entered the conservatory three years later. She studied Musical Theatre and one year of Opera. Later on, she started teaching performing in her own course called Wanna be a Star?!.

Floor plays the guitar, piano and flute and has completed several years of music studies, and has a Dramatic Soprano vocal range.