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I visited the Echo Amphitheater near Abiquiu, New Mexico, on March 16th, 2021. Before sitting down to play guitar near the center of the naturally-formed amphitheater, I recorded the sounds of four hand-claps and subsequent echoes with a TASCAM DR-05 field recorder. What resulted was this fun project on the acoustics of the amphitheater.
This was a talk I gave at the Graduate Students of Physics seminar in fall 2018. I describe several acoustic phenomena that have macroscopic analogues in the astrophysical world. I am grateful to have had Dr. Joe Izen and Dr. Kaloyan Penev in attendance. I am also grateful to the graduate students for their helpful feedback on my presentation.