Abstract: There are two reasons for the author of the article to have chosen to study the history of research of musical stylistics in Old Believers' religious verses. The one reason is that Old Believers' memorials were distinguished from the general Russia's repertoire quite late. The other reason is that there is a priority attention towards contents and poetic features of spiritual songwriting. The purpose of the present article is to systematise information sources that describe the history of establishment and development of researchers' interest in musical stylistics of Old Believers' spiritual verses while paying attention to the note publications and theoretical findings of different research genres. By using historiographic methods, the author has defined 70 publications including note compilations, or note records of individual samples in regional periodicals, descriptions of book compilations, musical poetical interpretations of local repertoires, and researches. Comparative analysis of publications has allowed to define key problems of researches devoted to Old Believers' spiritual songwriting, and to describe to what degree these regional traditions have been studied. The data that have been analysed prove that melodic features of spiritual verses are of great interest to reseachers in the spheres of musical archeography and medieval studies, ethnomusical studies, history of music, and regional studies of music that reveal musical-stylistic features of Old Believers' spiritual verses. The information sources systematised by the author can be used as references in various researches.