Great voice and thrilling Знаменное-ish harmonies.
(wiki)
Знаменное :
“Znamenny Chant (Russian: Знаменное пение, знаменный распев) is a singing tradition used by some in the Russian Eastern Orthodox Church.
The most notable feature of this notation system is that it records transitions of the melody, rather than notes.
cf. F. Mark Mealing/Our People’s Way/A Study in Doukhobor Hymnody & Folklife. U. Penna, 1972. The Strochnoy chant (early Russian polyphony) was also based on Znamenny chant, and although it is not widely used in the church practice now, it can be occasionally performed by some choirs. Many Russian composers (Sergei Rachmaninov, Alexander Grechaninov, Maximilian Steinberg, and Vladimir Martynov) studied Znamenny chants and used them in their compositions. There are also many adaptations of Znamenny melodies for four-part choir, popular in both Russia and abroad.
Because Znamenny Chant requires a specific manner of performance, the chant books contain several instructions as to dynamics and tempo. For the Old Believers church chant also has an educational function: one has to sing in such a way that the sound astonishes the ear and the truth, enclosed in the chants, penetrates the heart. Znamenny performance practice excludes classical vocal training. Singers perform with their own, natural voices, sometimes in a style reminiscent of folk music. Znamenny Chant does not have any pauses or rests, and all chants are performed fluently. Ideally, singers will sing in such a way that their voices become united in one single voice. “. . .
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This singer and his other musicians sing only Christian works, old hymns or songs in Russian and English, and original songs glorifying God, many based upon portions of the Bible, such as this one. But did not know there was a name for the quality or musical practice that produces the extreme bodily effects. Only knew it as Russian harmonies. Thank you for the descriptive name.