I did find some info on WHY and you are correct. "It is said that the Rockefeller Foundation had an interest in making sure the United States adopted the 440 Hz standard in 1935 as part of a “war on consciousness” leading to “musical cult control.” Without going too far down this rat hole, this theory says that tuning all music to 440 Hz turns it into a military weapon. I quote from one of the many online articles on the subject: “The monopolization of the music industry features this imposed frequency that is ‘herding’ populations into greater aggression, psychosocial agitation, and emotional distress predisposing people to physical illnesses and financial impositions profiting the agents, agencies, and companies engaged in the monopoly.”