Johann Sebastian Bach's 48 preludes and fugues numbered BWV 846-893, composed as two books under the name Das Wohltemperierte Klavier (The Well-Tempered Clavier) is one of the most performed works in present-day piano repertoire. This work from the point where it dominated the layers of meaning, contained a prerequisite for the work of the review it succeeded, with the importance in the interpretation of the named work, which during its time faced publication censorship for political reasons, couldn't pass the stage of being lecture notes and thus was not widely known and discussed. The work analyzes the theory explaining the relation between Christian mythology and J.S.Bach's works under the name of Das Wohltemperierte Klavier by one of the most active figures in 20th century Russian music culture, Boleslav Leopoldovich Yavorsky, who was a musicologist, composer, pianist, pedagogue and administrator. Yavorski made a connection between Das Wohltemperierte Klavier and Protestant Chorale in his theory, has identified musical motifs used frequently by Bach in religious stories which have joint text with preludes and fugues. The motifs have been linked with religious figures and events. The motifs symbolising the stories told in the Bible by Bach have been given in a parallel of eastetic Baroque era tradition but hidden in secular music forms. In the years of teaching courses in Russian State Conservatories, he has given depth and diversity to Bach music and has been referred in interpretations among generations of valued, important artists with the theory he put forward.