Happiness Frequency - Dopamine, Endorphin, Serotonin Release Music (Brain Health - 639 Hz)

This ancient and mystical frequency at 639 Hz has both a physical and mental effect. According to lore, it increases the release of the neurotransmitters serotonin, dopamine and endorphin. 

This frequency can also be called a resonant frequency because it causes a direct reaction in the body through other applications as well. It is therefore an effective biofrequency.