440 is also the numerical value of the Hebrew word for "dead" -- meit (מת) 
Death has the power to bring us together, across all the categories that divide us, if we let it.
According to Wikipedia:
"A440 is widely used as concert pitch in the United Kingdom and the United States. In continental Europe the frequency of A4 commonly varies between 440 Hz and 444 Hz."
Normally I don't find gematria to be helpful in understanding the world, but this one resonates with me.