a piano tuition method, Projet de méthode, to Alkan for completion. On 17 October, after midnight, the physician leaned over him and asked whether he was suffering greatly. "No longer", he replied. He died a few minutes before two o'clock in the morning. Those present at the deathbed appear to have included his sister Ludwika, Princess Marcelina Czartoryska, Sand's daughter Solange, and his close friend Thomas Albrecht. Later that morning, Solange's husband Clésinger made Chopin's death mask and a cast of his left hand. The funeral, held at the Church of the Madeleine in Paris, was delayed almost two weeks, until 30 October. Entrance was restricted to ticket holders as many people were expected to attend. Over 3,000 people arrived without invitations, from as far as London, Berlin and Vienna, and were excluded. Mozart's Requiem was sung at the funeral; the soloists were the soprano Jeanne-Anaïs Castellan, the mezzo-soprano Pauline Viardot, the tenor Alexis Dupont, and the bass Luigi Lablache; Chopin's Preludes No. 4 in E minor and No. 6 in B minor were also played. The organist at the funeral was Louis Lefébure-Wély. The funeral procession to Père Lachaise Cemetery, which included Chopin's sister Ludwika, was led by the aged Prince Adam Czartoryski. The pallbearers included Delacroix, Franchomme, and Camille Pleyel. At the graveside, the Funeral March from Chopin's Piano Sonata No. 2 was played, in Reber's instrumentation. Chopin's tombstone, featuring the muse of music, Euterpe, weeping over a broken lyre, was designed and sculpted by Clésinger. The expenses of the funeral and monument, amounting to 5,000 francs, were covered by Jane Stirling, who also paid for the return of the composer's sister Ludwika to Warsaw. As requested by Chopin, Ludwika took his heart (which had been removed by his doctor Jean Cruveilhier and preserved in alcohol in a vase), back to Poland in 1850. She also took a collection of two hundred letters from Sand to Chopin; after 1851 these were returned to Sand, who destroyed them. Chopin's disease and the cause of his death have been a matter of discussion. His death certificate gave the cause of death as tuberculosis, and his physician, Cruveilhier, was then the leading French authority on this disease. Other possibilities that have been advanced have included cystic fibrosis, cirrhosis, and alpha 1-antitrypsin deficiency. A visual examination of Chopin's preserved heart (the jar was not opened), conducted in 2014 and first published in the American Journal of Medicine in 2017, suggested that the likely cause of his death was a rare case of pericarditis caused by complications of chronic tuberculosis. Music Overview Over 230 works of Chopin survive; some compositions from early childhood have been lost. All his known works involve the piano, and only a few range beyond solo piano music, as either piano concertos, songs or chamber music. Chopin was educated in the tradition of Beethoven, Haydn, Mozart and Clementi; he used Clementi's piano method with his own students. He was also influenced by Hummel's development of virtuoso, yet Mozartian, piano technique. He cited Bach and Mozart as the two most important composers in shaping his musical outlook. Chopin's early works are in the style of the "brilliant" keyboard pieces of his era as exemplified by the works of Ignaz Moscheles, Friedrich Kalkbrenner, and others. Less direct in the earlier period are the influences of Polish folk music and of Italian opera. Much of what became his typical style of ornamentation (for example, his fioriture) is taken from singing. His melodic lines were increasingly reminiscent of the modes and features of the music of his native country, such as drones. Chopin