Between 1798 and 1802 Beethoven tackled what he considered the pinnacles of composition: the string quartet and the symphony. With the composition of his first six string quartets (Op. 18) between 1798 and 1800 (written on commission for, and dedicated to, Prince Lobkowitz), and their publication in 1801, along with premieres of the First and Second Symphonies in 1800 and 1802, Beethoven was justifiably considered one of the most important of a generation of young composers following Haydn and Mozart.He continued to write in other forms, turning out widely known piano sonatas like the "Pathetique" sonata (Op.

3), which Cooper describes as "surpass[ing] any of his previous compositions, in strength of character, depth of emotion, level of originality, and ingenuity of motivic and tonal manipulation. "[35] He also completed his Septet (Op. 20) in 1799, which was one of his most popular works during his lifetime. For the premiere of his First Symphony, Beethoven hired the Burgtheater on 2 April 1800, and staged an extensive program of music, including works by Haydn and Mozart, as well as the Septet, the First Symphony, and one of his piano concertos (the latter three works all then unpublished).The concert, which the Allgemeine musikalische Zeitung described as "the most interesting concert in a long time," was not without difficulties; among other criticisms was that "the players did not bother to pay any attention to the soloist.

"[36] While Mozart and Haydn were undeniable influences (for example, Beethoven's quintet for piano and winds is said to bear a strong resemblance to Mozart's work for the same configuration, albeit with his own distinctive touches),[37] other composers like Muzio Clementi were also stylistic influences[citation needed].Beethoven's melodies, musical development, use of modulation and texture, and characterization of emotion all set him apart from his influences, and heightened the impact some of his early works made when they were first published. [38] By the end of 1800 Beethoven and his music were already much in demand from patrons and publishers. [39] In May of 1799, Beethoven taught piano to the daughters of Hungarian Countess Anna Brunsvik.

While this round of lessons lasted less than one month, Beethoven formed a relationship with the older daughter Josephine that has been the subject of speculation ever since.Shortly after these lessons, she married Count Josef Deym. Beethoven was a regular visitor at their house, teaching and playing at parties. While her marriage was by all accounts unhappy, the couple had four children, and her relationship with Beethoven did not intensify until after Deym died in 1804.

[40] Beethoven had few other students. From 1801 to 1805, he tutored Ferdinand Ries, who went on to become a composer and later wrote Beethoven remembered, a book about their encounters. The young Carl Czerny studied with Beethoven from 1801 to 1803.Czerny went on to become a renowned music teacher himself, instructing Franz Liszt, and gave the Vienna premiere of Beethoven's fifth piano concerto (the "Emperor") in 1812. [citation needed]} Beethoven's compositions between 1800 and 1802 were dominated by two works, although he continued to produce smaller works, including the Moonlight Sonata. In the spring of 1801 he completed The Creatures of Prometheus, a ballet.

The work received numerous performances in 1801 and 1802, and Beethoven rushed to publish a piano arrangement to capitalise on its early popularity. 41] In the spring of 1802 he completed the Second Symphony, intended for performance at a concert that was ultimately canceled.The symphony received its premiere at a subscription concert in April 1803 at the Theater an der Wien, where Beethoven had been appointed composer in residence. In addition to the Second Symphony, the concert also featured the First Symphony, the Third Piano Concerto, and the oratorio Christ on the Mount of Olives.

While reviews were mixed, the concert was a financial success; Beethoven was able to charge three times the cost of a typical concert ticket. 42] Beethoven's business dealings with publishers also began to improve in 1802 when his brother Carl, who had previously assisted him more casually, began to assume a larger role in the management of his affairs. In addition to negotiating higher prices for recently composed works, Carl also began selling some of Beethoven's earlier unpublished works, and encouraged Beethoven (against the latter's preference) to also make arrangements and transcriptions of his more popular works for other instrument combinations.Beethoven acceded to these requests, as he could not prevent publishers from hiring others to do similar arrangements of his works. [43] Loss of hearing Around 1796, Beethoven began to lose his hearing.

[44] He suffered a severe form of tinnitus, a "ringing" in his ears that made it hard for him to perceive and appreciate music; he also avoided conversation. The cause of Beethoven's deafness is unknown, but it has variously been attributed to syphilis, lead poisoning, typhus, auto-immune disorder (such as systemic lupus erythematosus), and even his habit of immersing his head in cold water to stay awake.The explanation, from the autopsy of the time, is that he had a "distended inner ear" which developed lesions over time. Because of the high levels of lead found in samples of Beethoven's hair, that hypothesis has been extensively analyzed. While the likelihood of lead poisoning is very high, the deafness associated with it seldom takes the form that Beethoven exhibited.

[citation needed] As early as 1801, Beethoven wrote to friends describing his symptoms and the difficulties they caused in both professional and social settings (although it is likely some of his close friends were already aware of the problems). 45]Beethoven, on the advice of his doctor, lived in the small Austrian town of Heiligenstadt, just outside Vienna, from April to October 1802 in an attempt to come to terms with his condition. There he wrote his Heiligenstadt Testament, a letter to his brothers which records his thoughts of suicide due to his growing deafness and records his resolution to continue living for and through his art. [46] Over time, his hearing loss became profound: there is a well-attested story that, at the end of the premiere of his Ninth Symphony, he had to be turned around to see the tumultuous applause of the audience; hearing nothing, he wept.

Beethoven's hearing loss did not prevent his composing music, but it made playing at concerts—a lucrative source of income—increasingly difficult. After a failed attempt in 1811 to perform his own Piano Concerto No. 5 (the "Emperor"), which was premiered by his student Carl Czerny, he never performed in public again. A large collection of Beethoven's hearing aids such as a special ear horn can be viewed at the Beethoven House Museum in Bonn, Germany.

Despite his obvious distress, Carl Czerny remarked that Beethoven could still hear speech and music normally until 1812. [48] By 1814 however, Beethoven was almost totally deaf, and when a group of visitors saw him play a loud arpeggio of thundering bass notes at his piano remarking, "Ist es nicht schon? " (Is it not beautiful? ), they felt deep sympathy considering his courage and sense of humor (he lost the ability to hear higher frequencies first). [49] As a result of Beethoven's hearing loss, a unique historical record has been preserved: his conversation books.Used primarily in the last ten or so years of his life, his friends wrote in these books so that he could know what they were saying, and he then responded either orally or in the book. The books contain discussions about music and other matters, and give insights into his thinking; they are a source for investigation into how he felt his music should be performed, and also his perception of his relationship to art.

264 out of a total of 400 conversation books were destroyed (and others were altered) after Beethoven's death by Anton Schindler, in an attempt to paint an idealised picture of the composer.