) Calvocoressi's music criticism career can be divided into two: a French (1902–1914) and English (1921–1944) period. Described by Abraham as "a remarkable polyglot", Calvocoressi's career beginning in 1902 was as a music critic and correspondent for several English, American, German and Russian periodicals. Encouraged by the novelist
Binet-Valmer, the latter introduced him to
Octave Maus, an editor of the monthly ''
L'Art Moderne magazine. Calvocoressi became the Paris musical correspondent for L'Art Moderne'' and music critic for Binet-Valmer's
La Renaissance latine magazine; around then he also was music critic for the Anglo-French
Weekly Critical Review. Although some of these publications became obsolete in the next few years, Calvocoressi was well established enough to be unaffected. He contributed to other publications at various time: the daily
Gil Blas, the fortnightly ''
Comoedia Illustré' (part of Comœdia), the daily The Morning Post and particularly the monthly Musical Times''. Calvocoressi published his first book—a study on
Franz Liszt—in 1905, the year when he began writing for the English
Monthly Musical Record, began both a correspondence with the Russian composer
Mily Balakirev and developed a general interest in Russian music, particularly the work of
Modest Mussorgsky. He has been described by slavist
Caryl Emerson and musicologist Robert William Oldani as among the most important Western scholars of Mussorgsky. From 1907 to 1910 he served as an advisor for the impresario
Sergei Diaghilev, who organized Russian music and ballet concerts in Paris. For his efforts, the Russian government granted him the
Order of Saint Anna, while the Soviets later elected him a member of the
Academy of Sciences of the Soviet Union. He visited Russia for the first and only time in 1914, meeting with musical figures such as
Alexander Glazunov. Calvocoressi lectured at the
École des Hautes Études Sociales from 1905 to 1914, teaching about contemporary music. He also translated song texts, opera librettos and books from Russian and Hungarian into French and English. His next books included studies on Mussorgsky (1908),
Glinka (1911) and
Schumann (1912). Calvocoressi paused music criticism at the onset of
World War I in 1914, but found himself unable to serve the French due to his Greek ancestry. Later that year he moved to
London and served as a
cryptographer. He spent the rest of his life in England; he was naturalized and married Ethel Grey, a British citizen who was the dedicatee of many of his future books. These later studies were all in English, and their subjects included
Koechlin (1923), music criticism (1923), musical taste (1925), recollections of his musical experiences (1933),
Debussy (1944) as well on two studies each on Russian music (1936 & 1944) and Mussorgsky specifically (1946 & 1956). Emerson and Oldani remarked that these two Mussorgsky biographies have remained standard reference works on the composer. Although he continued music criticism in London from 1921 onwards, Abraham remarked that "he never enjoyed the influence and authority in London that he had exercised in Paris". Calvocoressi became well acquainted with "many distinguished Englishmen", including the author
Arnold Bennett and the composer
Ralph Vaughan Williams. He died in London on 1 February 1944. ==Selected writings==