Andrew Baena has answered the question of Lamb of God tuning way down before, but now he's back with a video featuring no actual instruments at all. Armed with a variety of guitar, bass, and drum samples, Baena has programmed an entire djent song with zero humans playing any of the instruments heard within.
I know this seems like an affront to musicians, but it's actually pretty cool for people who want to create music but don't really know how to play an instrument.
