Very interesting Ivan, and great! Related to harmonic fifths is the circle of 5ths, as established by J.S. Bach in the 18th Century. In a video on You Tube, Leonard Bernstein explains and demonstrates musical theory, culminating in the 5ths. Highly recommended!---Eric.
One of the coolest articles on sound and vibration I can recall having read
Steve Deckert over at Decware recently came up with a great read:
http://www.decware.com/newsite/DECWARESOUND.pdf
http://www.decware.com/newsite/DECWARESOUND.pdf