That “screamy” guy is Joe Prem, who was the sole vocalist prior to their inclusion of female vocals. Sabine was their keyboardist and unofficial sixth member, until her vocal contributions convinced them to include her as a co-frontwoman. This development occurred independently of the “female fronted” trend, and was quite natural for their musical progression. That said, this album rips. A little more straightforward and commercial than previous releases (just a little), but A+ solid songwriting. Awesome band.