it's my understanding that "A" was changed from 432hz to 440hz sometime around the 30's or 40's to add to the "dissonance" and keep music from being pleasant and true on DNA level.
i remember learning as a kid how satan was the 'minister of music' in heaven and how his body was literally made of instruments. if our enemy is a master of music then this makes perfect sense:
change the standard tuning then ALL of it becomes detructive on a molecular level.
or something like that. [how do we change that back?]