The composer, theorist and teacher Kazimierz Sikorski attended the class of Felicjan Szopski at the music school run by the Warsaw Music Society, before graduating from the philosophy department of Warsaw University. In 1921, he began musicology studies with Adolf Chybiński in Lviv, and from 1930 with Nadia Boulanger in Paris. In 1926-27, he lectured in music theory and composition at the State Conservatory of Music in Poznań, and then in music theory and composition at the SCM in Warsaw. During the Second World War, he was vice director of the Staatliche Musikschule in Warschau, which essentially continued the programme of earlier years.
After the war, he worked at music colleges in Łódź and then Warsaw. In 1975, he became the first ever recipient of an honorary doctorate from Warsaw College of Music. He held many functions in numerous musical organisations in Poland; among other things, he was a founder member of the Polish Composers' Association (1929-39), vice president of the classical music section of ZAiKS (1935-39), chair of the Karol Szymanowski Society (1937-39) and a member of the editorial committee of the Rocznik Chopinowski / Annales Chopin.
In 1970 and 1975, he sat on the jury of the International Fryderyk Chopin Piano Competition, in 1975 as the jury chair. In 1981, he was appointed honorary president of the Fryderyk Chopin Society in Warsaw.
