Nikolay Diletsky

Nikolay Diletsky (Ukrainian: Микола Дилецький, Mykola Dyletsky, Russian: Николай Павлович Дилецкий, Nikolay Pavlovich Diletsky, Nikolai Diletskii, Polish: Mikołaj Dilecki, also Mikolaj Dylecki, Nikolai Dilezki, etc.

A remark by Ioannikii Trofimovich Korenev, a fellow theorist who describes him as a resident of Kiev, is considered evidence of Diletsky's Ukrainian origins.

The text is now lost, but it is known that it was written in Polish, and the surviving title page[2] indicates that it was probably a panegyrical pamphlet.

After Vilnius, Diletsky lived in Smolensk, where in 1677 the first surviving version of his magnum opus, Grammatika musikiyskago peniya ("A grammar of musical singing"), was written.

Apart from the tremendous influence it had on subsequent generations of Russian church composers, the Grammatika is of particular interest for having the first known description of the circle of fifths, one that antedates Western examples by several decades.