The Schumann Resonance, named after German physicist Winfried Otto Schumann, refers to the Earth's natural electromagnetic resonance frequency. It is created by the voids between the Earth's surface and the ionosphere, a layer in the upper atmosphere.

The cosmic octave is a concept found in various disciplines including music, philosophy, physics and spirituality. It refers to the idea that there is a connection between the harmonic vibrations in the universe and music.

Biorhythm refers to the recurring, natural rhythm of biological processes in an organism's body. These physiological cycles repeat at regular intervals and influence various aspects of physical, emotional and mental activity.