The singsong thing traces to the mid-'90s, when Fear Factory started looking for a way to sound a little less industrial. As nü metal started to fade, Slipknot demonstrated that a singer could sing while still wielding balls of steel.
But now the loud-soft dynamic is everywhere, even in "What Drives the Weak," the current single from Shadows Fall, a band hyped as bearing the standard of old-school thrash. Duality is nice, and we get the whole yin-yang thing, but it seems self-defeating to interrupt a mosh suite with a 15-second sample from the Nickelback songbook, especially if it's a bid for radio play. They should take a cue from tourmates Lamb of God, whose latest, Ashes of the Wake, proves that mass-market metal doesn't need to compromise.