From top to bottom - Soprano, Alto, Tenor, Bass. Generally, women sing the first two, and men the second, although that's obviously not the case in single-sex choirs,
I didn't forget - was just trying to keep it simple. And of course, both of us are assuming we're talking singers here and not saxophones - soprillo, sopranino, soprano, alto, tenor, baritone, bass, tubax contra bass, subcontrabass... ;-)
actually zina95 asked about an alot, - which as every zorgian knows is in the ultra-sound register, and is the reason why your neighbours remote control switches your tv channel