There are six main solfeggio frequencies: 396 Hz, 417 Hz, 528 Hz, 639 Hz, 741 Hz, and 852 Hz. The three additional tones are: 174 Hz, 285 Hz, and 963 Hz. It's a fact that these frequencies promote healing has been confirmed by many scientists such as Dr. Lee Lorenzen, who discovered their resonant effect on water molecules.