An octavist or oktavist sometimes referred to as contrabass (; also called sub-bass in southern gospel groups or a cappella contemporary Christian groups) 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 a rare few even lower. Because the voice usually takes a very long time to develop and grow, low notes sound resonant and full, when the singer is around 40 or even 50 years of age, thus the part is often reserved to older men. This practice and tradition is illustrated in the CD "Basso Profondo From Old Russia". On the sixth track, "Do Not Reject Me In My Old Age" (Ne Otverzhi Mene) by Pavel Chesnokov, the oktavist soloist sings a G1. thumb|680px|Approximate vocal range of an operatic basso profondo, middle C to (C2), vocal range of a Russian Octavist, middle C to (G1) and rarely to (F1), most Octavists have an optimal comfortable vocal range of A1-E3
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