Keywords: Diletsky circle.jpg Circle of fifths featured in the 1679 version of Nikolay Diletsky's Idea grammatiki musikiyskoy Idea grammatiki musikiyskoy Идея г амматики музикийской An idea of musical grammar GBL 107 p 134 <br/> The manuscript is held by the Russian State Library 1679 Author PD-old-100 Nikolay Diletsky Circle of fifths Russian text |