I find the Mother of Tone web site to be an outstanding reference toward the understanding of this subject - this page in particular:
http://www.mother-of-tone.com/vibration.htm
... but especially the following page:
http://www.mother-of-tone.com/mother.htm
But read at your own risk, as you will not be the same after.
http://www.mother-of-tone.com/vibration.htm
... but especially the following page:
http://www.mother-of-tone.com/mother.htm
But read at your own risk, as you will not be the same after.