structural:scholar_edition, linguistic:paraphrasing
International career

In 1899, Casals played at The Crystal Palace in London, and later for Queen Victoria at Osborne House, her summer residence, accompanied by Ernest Walker. On 12 November, and 17 December 1899, he appeared as a soloist at Lamoureux Concerts in Paris, to great public and critical acclaim. He toured Spain and the Netherlands with the pianist Harold Bauer from 1900 to 1901; in 1901/02 he made his first tour of the United States; and in 1903 toured South America.

On 15 January 1904, Casals was invited to play at the White House for President Theodore Roosevelt. On 9 March of that year he made his debut at Carnegie Hall in New York, playing Richard Strauss 's Don Quixote under the baton of the composer. In 1906, he became associated with the talented young Portuguese cellist Guilhermina Suggia, who studied with him and began to appear in concerts as Mme. P. Casals-Suggia, although they were not legally married. Their relationship ended in 1912.

The New York Times of 9 April 1911 announced that Casals would perform at the London Musical Festival to be held at the Queen's Hall on the second day of the Festival (23 May). The piece chosen was Haydn 's Cello Concerto in D and Casals would later join Fritz Kreisler for Brahms 's Double Concerto for Violin and Cello.

In 1914, Casals married the American socialite and singer Susan Metcalfe; they were separated in 1928, but did not divorce until 1957.

Although Casals made his first recordings in 1915 (a series for Columbia), he would not release another recording until 1926 (on the Victor label).

Back in Paris, Casals organized a trio with the pianist Alfred Cortot and the violinist Jacques Thibaud; they played concerts and made recordings until 1937. Casals also became interested in conducting, and in 1919 he organized, in Barcelona, the Pau Casals Orchestra and led its first concert on 13 October 1920. With the outbreak of the Spanish Civil War in 1936, the Orquesta Pau Casals ceased its activities.

Casals was an ardent supporter of the Spanish Republican government, and after its defeat vowed not to return to Spain until democracy was restored. Casals performed at the Gran Teatre del Liceu on 19 October 1938, possibly his last performance in Spain before his exile.

In the last weeks of 1936, he stayed in Prades, a small village in France near the Spanish border, where Casals would settle in 1939, in Pyrénées-Orientales, an historically Catalan region. Between 1939 and 1942 he made sporadic appearances as a cellist in the unoccupied zone of southern France and in Switzerland. He was mocked by the Francoist press, which wrote articles deriding him as "a donkey", and was fined one million pesetas for his political views. So fierce was his opposition to Francoist Spain that he refused to appear in countries that recognized the Spanish government. He made a notable exception when he took part in a concert of chamber music in the White House on 13 November 1961, at the invitation of President John F. Kennedy, whom he admired. On 6 December 1963, Casals was awarded the U.S. Presidential Medal of Freedom.

Throughout most of his professional career, he played on a cello that was labeled and attributed to " Carlo Tononi... 1733" but after he had been playing it for 50 years it was discovered to have been created by the Venetian luthier Matteo Goffriller around 1700. Casals acquired it in 1913. He also played another cello by Goffriller dated 1710, and a Tononi from 1730.