 Acoustic emission spectroscopy has been used to analyze various types of materials, including biological samples, kidney stones, and geological materials. In biological samples, discrepancies between strong and weak AE signals were observed, suggesting that different mechanisms may be at play when dealing with different types of samples. Additionally, it was found that certain frequencies and energies could be used to trigger the destruction of kidney stones. Finally, in geological materials, warning signs of impending collapse were observed, indicating that these materials are prone to catastrophic failure. This article was authored by Jack T. Eckstein, Michael A. Carpenter and Eckard K. H. Selj.