Keywords: Diletsky signature.jpg Nikolay Diletsky's signature at the end of the 1679 version of Idea grammatiki musikiyskoy Idea grammatiki musikiyskoy Идея г амматики музикийской An idea of musical grammar GBL 107 p 233 <br/> The manuscript is held by the Russian State Library 1679 Author PD-old-100 Nikolay Diletsky |