The year 1898 can be reckoned among the crucial ones in the field of musicology. For in that year a work was published which can be considered as one of the main starting-points for the study of music during the Dufay period; that is to say, the first half of the 15th century. This work is the monumental edition of fifty compositions from the Codex Canonici 213, edited by Sir John Stainer, with the co-operation of his son and daughter and of E. W. B. Nicholson.