528 Hz is MI, the Solfeggio tone Leonard Horowitz popularised as the 'love' or 'miracle' frequency, its name drawn from the Latin 'MI-ra gestorum'. It is the best known tone of the whole tradition. Seated at the solar plexus, it is described in the lore as a tone of transformation and repair. Auriviel presents it as music with a rich story, not a medical claim. The Solfeggio names descend from the medieval hymn to St. John that Guido d'Arezzo used to teach singers: Ut, Re, Mi, Fa, Sol, La. In the 1970s Dr. Joseph Puleo reported recovering a six-tone set of pitches from a numeric reading of the Book of Numbers, and Leonard Horowitz carried the idea to a wide audience. Placing those six tones against the seven-chakra ladder is a later, devotional overlay, a way of hearing the scale as a climb through the body rather than a claim from the original tradition. Independent of any tradition, controlled clinical evidence that a specific frequency produces a specific health effect is limited and mixed. Auriviel presents these tunings as music and contemplative practice. This page is for general information and relaxation. Auriviel's frequency music is not medical advice, diagnosis, or treatment, and no health outcome is claimed. If you have a medical concern, please consult a qualified professional.