Music and Time Annotation << Back Natural Horn in Treatise of V. Reser. «Experience Instruction of Those Who Compose for Clarinet and Horn...» 1764 A. Furukin This article examines the treatise prominent German musician, composer Valentin Roeser called «Experience the instructions of those who compose for Clarinet and Horn ... «Reser wrote this work during the period when the fashion and ubiquitous harmonic music that is relevant for that time. Treatise describes the correct use of techniques horns. Namely consider the part that is devoted to the natural horn, provides a complete overview of temperaments, their ranges features which notes are comfortable and which are not convenient, just here tells what technique is applicable and what is not. In other words Treatise Valentine Roeser shows thoroughly developed and theoretically meaningful interpretation of the principles of horns in the early classicism. Keywords: Valentin Roeser, natural horn, harmonic music, technique of stopped sounds, clarino. Contacts: E-mail: alekseyfurukin@gmail.com Pp. 65-68.