Tuning down can be a funny thing though. Sometimes, you barely notice, and it really helps the singer a lot. Sometimes, it makes a song sound heavier. But sometimes, it just sucks the life out of a song and makes it sound horrible, even if it helps the singer nail the vocal lines. An incident that always sticks out in my mind is when I saw Tesla a few years ago. They did not downtune on everything, but did on a few select songs, including Edison's Medicine. While it helped Jeff Keith a lot, the songs overall just sounded horrible and had no energy whatsoever. So as far as Harris refusing to tune down, although it very well might just be stubbornness, I have to defer to his judgment. If he feels it takes away from the songs, I respect that.