Author works of Old Russian masters of church singing art in the Ural old believer manuscript tradition

Manuscript monuments of the Ural Old Believers kept many chants which is a treasure of Old Russian singing art. In the article the author researches issues to which criterion the old author works were chosen for the collected singing of old believers, and which of the chants of the same carol of the old Russian period was included into performance tradition of the Old Believer church singing masters