OKTAVIST
Oktavist
An octavist or oktavist sometimes referred to as contrabass is a type of male singer who sings an octave below the normal bass part, especially typical of Russian Orthodox vocal music. This voice type has a lower vocal range than that which the Western school of music terms "basso profondo". Indeed, a singer of this voice type sings a full octave below the first-bass register, having an optimal comfortable vocal range of A1-E3, though some reach as far down as F1 and an absolutely rare few even lower.The above text is a snippet from Wikipedia: Oktavist
and as such is available under the Creative Commons Attribution/Share-Alike License.