Ancient technology used sound frequencies as an energy source as evidenced by cymatics. Current developments in archaeology prove quantum technology was used to build and power the ancient world wide civilazation.
Abraham Hicks , The art to train yourself to perceive more - powerful segment - YouTube
This is a video of a Chladni plate experiment in which sand resonates to different frequencies to reveal a particular frequency's SECRET PATTERN. And we all love secret patterns here, right? Think of it as a special door knock.