Pyotr Ilyich Tchaikovsky ( 7 May 1840 – 6 November 1893),anglicised as Peter Ilyich Tchaikovsky was a Russian composer whose works included symphonies, concertos, operas, ballets, chamber music, and a choral setting of the Russian Orthodox Divine Liturgy. Some of these are among the most popular theatrical music in the classical repertoire. He was the first Russian composer whose music made a lasting impression internationally, which he bolstered with appearances as a guest conductor later in his career in Europe and the United States. One of these appearances was at the inaugural concert of Carnegie Hall in New York City in 1891. Tchaikovsky was honored in 1884 by Emperor Alexander III, and awarded a lifetime pension in the late 1880s.
Although musically precocious, Tchaikovsky was educated for a career as a civil servant. There was scant opportunity for a musical career in Russia at that time, and no system of public music education. When an opportunity for such an education arose, he entered the nascent Saint Petersburg Conservatory, from which he graduated in 1865. The formal Western-oriented teaching he received there set him apart from composers of the contemporary nationalist movement embodied by the Russian composers of The Five, with whom his professional relationship was mixed. Tchaikovsky's training set him on a path to reconcile what he had learned with the native musical practices to which he had been exposed from childhood. From this reconciliation, he forged a personal but unmistakably Russian style—a task that did not prove easy. The principles that governed melody, harmony and other fundamentals of Russian music ran completely counter to those that governed Western European music; this seemed to defeat the potential for using Russian music in large-scale Western composition or from forming a composite style, and it caused personal antipathies that dented Tchaikovsky's self-confidence. Russian culture exhibited a split personality, with its native and adopted elements having drifted apart increasingly since the time of Peter the Great, and this resulted in uncertainty among the intelligentsia of the country's national identity.

Wolfgang Amadeus Mozart (27 January 1756 – 5 December 1791), baptised as Johannes Chrysostomus Wolfgangus Theophilus Mozart, was a prolific and influential composer of the Classical era.
Mozart showed prodigious ability from his earliest childhood. Already competent on keyboard and violin, he composed from the age of five and performed before European royalty. At 17, he was engaged as a court musician in Salzburg, but grew restless and travelled in search of a better position, always composing abundantly. While visiting Vienna in 1781, he was dismissed from his Salzburg position. He chose to stay in the capital, where he achieved fame but little financial security. During his final years in Vienna, he composed many of his best-known symphonies, concertos, and operas, and portions of the Requiem, which was largely unfinished at the time of his death. The circumstances of his early death have been much mythologized. He was survived by his wife Constanze and two sons.
He composed over 600 works, many acknowledged as pinnacles of symphonic, concertante, chamber, operatic, and choral music. He is among the most enduringly popular of classical composers, and his influence on subsequent Western art music is profound; Beethoven composed his own early works in the shadow of Mozart, and Joseph Haydn wrote that "posterity will not see such a talent again in 100 years.

The Requiem Mass in D minor (K. 626) by Wolfgang Amadeus Mozart was composed in Vienna in 1791 and left unfinished at the composer's death on December 5. A completion dated 1792 by Franz Xaver Süssmayr was delivered to Count Franz von Walsegg, who had anonymously commissioned the piece for a requiem mass to commemorate the February 14 anniversary of his wife's death.
The autograph manuscript shows the finished and orchestrated introit in Mozart's hand, as well as detailed drafts of the Kyrie and the sequence Dies Irae as far as the first nine bars of "Lacrimosa", and the offertory. It cannot be shown to what extent Süssmayr may have depended on now lost "scraps of paper" for the remainder; he later claimed the Sanctus and Agnus Dei as his own. Walsegg probably intended to pass the Requiem off as his own composition, as he is known to have done with other works. This plan was frustrated by a public benefit performance for Mozart's widow Constanze. A modern contribution to the mythology is Peter Shaffer's 1979 play Amadeus, in which a mysterious messenger orders Mozart to write a requiem mass, giving no explanation for the order; Mozart (in the play) then comes to believe that the piece is meant to be the requiem mass for his own funeral.
The Requiem is scored for 2 basset horns in F, 2 bassoons, 2 trumpets in D, 3 trombones (alto, tenor & bass), timpani (2 drums), violins, viola and basso continuo (cello, double bass, and organ). The vocal forces include soprano, contralto, tenor, and bass soloists and an SATB mixed choir.

Wolfgang Amadeus Mozart (27 January 1756 – 5 December 1791), baptised as Johannes Chrysostomus Wolfgangus Theophilus Mozart, was a prolific and influential composer of the Classical era.
Mozart showed prodigious ability from his earliest childhood. Already competent on keyboard and violin, he composed from the age of five and performed before European royalty. At 17, he was engaged as a court musician in Salzburg, but grew restless and travelled in search of a better position, always composing abundantly. While visiting Vienna in 1781, he was dismissed from his Salzburg position. He chose to stay in the capital, where he achieved fame but little financial security. During his final years in Vienna, he composed many of his best-known symphonies, concertos, and operas, and portions of the Requiem, which was largely unfinished at the time of his death. The circumstances of his early death have been much mythologized. He was survived by his wife Constanze and two sons.
He composed over 600 works, many acknowledged as pinnacles of symphonic, concertante, chamber, operatic, and choral music. He is among the most enduringly popular of classical composers, and his influence on subsequent Western art music is profound; Beethoven composed his own early works in the shadow of Mozart, and Joseph Haydn wrote that "posterity will not see such a talent again in 100 years

Franz Joseph Haydn (31 March 1732 – 31 May 1809), known as Joseph Haydn, was an Austrian composer, one of the most prolific and prominent of the Classical period. He is often called the "Father of the Symphony" and "Father of the String Quartet" because of his important contributions to these forms. He was also instrumental in the development of the piano trio and in the evolution of sonata form.
A lifelong resident of Austria, Haydn spent much of his career as a court musician for the wealthy Esterházy family on their remote estate. Isolated from other composers and trends in music until the later part of his long life, he was, as he put it, "forced to become original".[6] At the time of his death, he was one of the most celebrated composers in Europe.
Joseph Haydn was the brother of Michael Haydn, himself a highly regarded composer, and Johann Evangelist Haydn, a tenor.

Joseph Haydn's PianoConcerto No. 11 in D major was written between 1780 and 1783. It was originally composed for harpsichord or fortepiano and scored for an orchestra in a relatively undeveloped galant style evident in his early works, and has a lively Hungarian Rondo finale. On the other hand, being a somewhat later composition, it also shows more similarities to Mozart's piano concertos than do Haydn's other keyboard concertos. It consists of three movements:

Vivace
Un poco adagio
Rondo all'Ungarese

Franz Joseph Haydn (31 March 1732 – 31 May 1809), known as Joseph Haydn,was an Austrian composer, one of the most prolific and prominent of the Classical period. He is often called the "Father of the Symphony" and "Father of the String Quartet" because of his important contributions to these forms. He was also instrumental in the development of the piano trio and in the evolution of sonata form.
A lifelong resident of Austria, Haydn spent much of his career as a court musician for the wealthy Esterházy family on their remote estate. Isolated from other composers and trends in music until the later part of his long life, he was, as he put it, "forced to become original".At the time of his death, he was one of the most celebrated composers in Europe.

The Symphony No. 82 in C major, is the first of the so-called six Paris Symphonies (numbers 82-87) written by Joseph Haydn. It is popularly known as the Bear Symphony.

Franz Joseph Haydn (31 March 1732 – 31 May 1809), known as Joseph Haydn,was an Austrian composer, one of the most prolific and prominent of the Classical period. He is often called the "Father of the Symphony" and "Father of the String Quartet" because of his important contributions to these forms. He was also instrumental in the development of the piano trio and in the evolution of sonata form.
A lifelong resident of Austria, Haydn spent much of his career as a court musician for the wealthy Esterházy family on their remote estate. Isolated from other composers and trends in music until the later part of his long life, he was, as he put it, "forced to become original".At the time of his death, he was one of the most celebrated composers in Europe.

The Symphony No. 83 in G minor, is the second of the six so-called Paris Symphonies (numbers 82-87) written by Joseph Haydn in 1785 and it was published by Artaria in Vienna in December 1787. It is popularly known as The Hen.

Ludwig van Beethoven's Violin Concerto in D major, Op. 61, was written in 1806.
The work was premiered on 23 December 1806 in the Theater an der Wien in Vienna. Beethoven wrote the concerto for his colleague Franz Clement, a leading violinist of the day, who had earlier given him helpful advice on his opera Fidelio. The occasion was a benefit concert for Clement. However, the first printed edition (1808) was dedicated to Beethoven’s friend Stephan von Breuning.
It is believed that Beethoven finished the solo part so late that Clement had to sight-read part of his performance. Perhaps to express his annoyance, or to show what he could do when he had time to prepare, Clement is said to have interrupted the concerto between the first and second movements with a solo composition of his own, played on one string of the violin held upside down;however, other sources claim that he did play such a piece but only at the end of the program.
The premiere was not a success, and the concerto was little performed in the following decades.
The work was revived in 1844, well after Beethoven's death, with performances by the then 12-year-old violinist Joseph Joachim with the orchestra conducted by Felix Mendelssohn. Ever since, it has been one of the most important works of the violin concerto repertoire, and it is frequently performed and recorded today.

The Partita No. 3 in E major BWV 1006 by Johann Sebastian Bach for solo violin is the last work in the set of Six Sonatas and Partitas. It consists of the following movements:

Preludio
Loure
Gavotte en Rondeau
Menuets (I and II)
Bourrée
Giga

It takes approximately 20 minutes to perform.

Carl Philipp Emanuel Bach (8 March 1714 – 14 December 1788) was a German Classical period musician and composer, the fifth child and second (surviving) son of Johann Sebastian Bach and Maria Barbara Bach.
Emanuel Bach was an influential composer working at a time of transition between his father's baroque style and the classical and romantic styles that followed it. Bach's dynamism stands in deliberate contrast to the more mannered rococo style also then in vogue.

Johann Christian Bach (September 5, 1735 – January 1, 1782) was a composer of the Classical era, the eleventh child and youngest son of Johann Sebastian Bach. He is sometimes referred to as "the London Bach" or "the English Bach", due to his time spent living in the British capital, where he came to be known as John Bach. He is noted for influencing the concerto style of Mozart.

Ludwig van Beethoven's Symphony No. 3 in E-flat major (Op. 55), also known as the Eroica (Italian for "heroic"), is a musical work marking the full arrival of the composer's "middle-period," a series of unprecedented large scale works of emotional depth and structural rigor.
The symphony is widely regarded as a mature expression of the classical style of the late eighteenth century that also exhibits defining features of the romantic style that would hold sway in the nineteenth century. The Third was begun immediately after the Second, completed in August 1804, and first performed 7 April 1805.