www.bobdecker.net The Schumann Resoonance at 7.83 Hz is said to be the frequency of our planet. At 27.3 Hz it is at a higher octave which I find to be very uplifting. You don’t need headphones to experience the tones.
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I liked a YouTube video — BINAURAL BEATS VS ISOCHRONIC TONES – HEAR THE DIFFERENCE NOW! http://youtu.be/3DK2pxaOouc?a – by antiagingdr (Dr Joe Markovich)

Indigo Chromotherapy With Alpha Binaural Beats & Isochronic Tones – Listen Free, Feel the Power! http://bit.ly/gN3g1H – by jsepperson (J.S. Epperson)