When we hear music rich in harmonics, like Gregorian Chant, Indian classical music or a cappella singing it induces an altered state of consciousness. It changes our brain patterns so that we feel more relaxed, more connected with the music.
Ancient cultures understood the power of harmonics. Stringed instruments are particularly rich in harmonics. In the bible, David is said to have played the harp to heal King Sauls depression. Orpheus played the lyre, another stringed instrument in Ancient Greek mythology. In India, Saraswati, the Goddess of wisdom and music, is seen playing the Veena, a stringed instrument.
* Khöömii is an amazing style of overtone/harmonic singing where one person sings two or more distinct pitches at the same time. It originates among the nomads of the central Asian plateau, particularly the Altai and Sayan mountain regions of Mongolia and Tuva.The nomads of these parts have discovered how to sing melodies that arise from the universal overtone or harmonic series. Listen to your own overtones as you discover the unknown depths and heights of your own voice through these enchanting sounds.<span class="plainlinks">[http://www.youtube.com/watch?v=gQUgtEBbPi4example : Khöömii]</span>
==Intervals==