Pau Casals i Defilló (Catalan and so Spanish: [ˈpaw kəˈzalz i ðəfiˈʎo]; 29 December 1876 – 22 October 1973), usually known in English as Pablo Casals, was a cellist, composer, and conductor from Catalonia.He is generally regarded as the pre-eminent cellist of the first half of the 20th century, and one of the greatest cellists of all time.