This is a rather unbelievable story. “When [the two researchers] met, Pentcheva started telling Abel about the Hagia Sophia – how we couldn’t really understand the experience of worshipers there unless we could hear the music the way they did. And as she talked, Abel started to feel a prickling of excitement. They could recreate what that music would sound like. If only they could get in the Hagia Sophia and pop a balloon.” (Note: They did.) – NPR