https://www.youtube.com/watch?v=oVinnWp1Pck#t=19 This piece of audio depicts a reconstruction of what a variety of Aztec whistles sounded like. The first, and most chilling, has been nicknamed the "Whistles of Death," as they are believed to have been played shortly before victims were sacrificed to the gods. It's assumed that this is the very last noise heard by untold thousands of victims.