The Voice Of This Russian Oktavists Will Give You Goosebumps
The oktavist is a type of voice used in Russian liturgical and folk music. These singers sing roughly an octave below the bass range. The point of this video, however, is not to demonstrate the sheer depth of these voices, but rather their power.
Any bass can croak these notes into a microphone, but what sets these voices apart is their ability to perform notes like this over a choir, to a large audience, with absolutely no amplification.