Most music worldwide has been tuned to 440 hertz since the International Standards Organization (ISO) endorsed it in 1953. The recent rediscoveries of the vibratory / oscillatory nature of the universe indicate that this contemporary international concert pitch standard may generate an unhealthy effect or anti-social behavior in the consciousness of human beings.
432 Hz, known as Verdi's 'A' is an alternative tuning that is mathematically consistent with the universe. Music based on 432 Hz transmits beneficial healing energy, because it is a pure tone of math fundamental to nature.
There is a theory that the change from 432 Hz to 440 Hz was dictated by Nazi propaganda minister, Joseph Goebbels. He used it to make people think and feel a certain manner, and to make them a prisoner of a certain consciousness. Then around 1940 the United States introduced 440 Hz worldwide, and finally in 1953 it became the ISO 16-standard.