sentence: 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 definition pavel chesnokov divides the bass section into these groups : so it makes sense to put most basses who fall in between e2 and c2 in the third and fourth groups , depending on their power .