Musicology Annotation << Back Theory of Genus by F. Salinas (On the Basis of the Treatise «De musica») Polunina E.N. The article is dedicated to the theory of genus of F. Salinas. On the basis of the treatise «De musica» the sound system in which the octave divides more than on twelve sounds is considered. The author specifies the reasons of multiple divisions of octave in music of the late Renaissance and comes to the conclusions about specificity of functioning of interval genus in the West-European musical art of the 16th century. Key words: Salinas, interval genus, harmony. E-mail: hellennik@mail.ru