Tami Simon speaks with Alex Theory a talented musician who draws upon his training in shamanic practice, psychology, and music production in order to develop new techniques and approaches in music and sound therapy. Through Sounds True, Alex has released a series called Full Spectrum Sound Healing; a four-CD exploration of the healing frequencies and sonic characteristics of the elements light, earth, air, and water. Alex discusses the role of sound technology in the 21st century, the work of Alfred Tomatis, and the sound frequency of the earth itself (what's called the Schumann Resonance). (67 minutes)