Oil painting for Taos Astrologer Rex Estell 

Inseparable from magical speculation about words is the theory of vibrations, which supposes that certain sounds have a powerful acoustic impact on both the physical and astral worlds. That vibrations do in fact govern sound is confirmed by physics which teach us that sound originates when molecules begin to vibrate and trigger off a wave formed by sympathetic vibration of neighboring molecules. 

Magic: An Occult Primer 
David Conway