Cymatics is a very interesting topic. It illustrates how sound frequencies move through a particular medium such as water, air, or sand and as a result directly alter physical matter. There are a number of pictures all over the internet as well as youtube videos that demonstrate how matter (particles) adjust to different sounds and different frequencies of sound.
When it comes to ancient knowledge, sound, frequency and vibration have always been perceived as powerful forces that can influence and alter life all the way down to the cellular level. Sound healing methods are often used by Shamans, who employ drums and singing to access trance states. Research has even demonstrated that drumming and singing can can be used to slow fatal brain disease, and it can generate a sense of oneness with the universe . Sound therapy is getting more popular, and it can have many medical applications, especially within the psychological and mental health realms.