But on the other hand I have no interest to sing notes out of common voice-range: some voices out on the above or below dynamic voice scale.
At spring Tim Storms reclaimed the record for the lowest note produced by a Human. The new record is G-7, or .189Hz (find out: point 189 Hertz). That is 8 octaves below the lowest G on the piano.
He can try, I suppose, again the low D of L'Incoronazione di Poppea.
I made a song about The Boss, in which I will sing below the scale of the guitar.