most significant of the new contacts was Busoni. The great pianist and composer became Szigeti's mentor during these formative years, and the two would remain close friends until Busoni's death in 1924. By Szigeti's own admission, before meeting Busoni his life was characterized by a certain laziness and indifference brought on by the then-typical life of a young prodigy violinist. He had grown accustomed to playing crowd-pleasing salon miniatures and dazzling virtuosic encores without much thought. He knew little of the works of the great masters; he could play them, but not fully understand them. As Szigeti put it, Busoni—particularly through their careful study of Bach's Chaconne—"shook me once and for all out of my adolescent complacency". Illness and new beginnings In 1913, Szigeti was diagnosed with tuberculosis and was sent to a sanatorium in Davos, Switzerland to recover, interrupting his concert career. During his stay at the sanatorium, he became re-acquainted with the composer Béla Bartók, who was recovering from pneumonia. His doctor recommended to practice the violin 25 to 30 minutes a day. The two had known each other only in passing during their conservatory days, but now they began a friendship that would last until Bartók's death in 1945. Szigeti was allowed to visit Bartok for the last time in 1943 at Mount Sinai Hospital (Manhattan), New York with his illness worsening, reading Turkish poems while they spread out on his hospital bed. In 1917, having by then made a full recovery, at age 25 Szigeti was appointed Professor of Violin at the Geneva Conservatory of Music. Szigeti said that this job, although generally satisfying, was often frustrating due to the mediocre quality of many of his students. The years teaching in Geneva provided an opportunity for Szigeti to deepen his understanding of music as an art, along with other aspects such as chamber music, orchestral performance, music theory and composition. Also during that time, Szigeti met and fell in love with Wanda Ostrowska, a young woman of Russian parentage who had been stranded in Geneva by the Russian Revolution of 1917. They married in 1919. American debut In 1925, Szigeti met Leopold Stokowski and played the Bach Chaconne in D minor for him. Less than two weeks later, Szigeti received a telegram from Stokowski's manager in Philadelphia inviting him to perform with the Philadelphia Orchestra later that year: it was his American debut. Szigeti had never