https://phys.org/news/2018-06-volcano-music-scientists-eruptions.html > "It's the largest organ pipe you've ever come across," said Jeff Johnson, a volcanologist at Boise State University in Idaho and lead author of a new study detailing the findings in Geophysical Research Letters, a journal of the American Geophysical Union. Listen to Cotopaxi's unique organ pipe sounds here. > The new findings show the geometry of a volcano's crater has a major impact on the sounds a volcano can produce. Understanding each volcano's unique "voiceprint" can help scientists better monitor these natural hazards and alert scientists to changes going on inside the volcano that could signal an impending eruption, according to the study authors.