This two-part episode of Echolocation originally aired on WGXC on December 10, 2016.

On this autumn broadcast of Echolocation, we'll contemplate the age-old question "when a tree falls in the woods and there’s no one there to hear it, does it make a sound?" In the first hour, we'll feature little brown bats and gunshot reverberations, as well as singing, bioluminescent fish. In the second hour, we'll remember three great artists who passed beyond the veil this Autumn - musician and composer Pauline Oliveros; soul singer for the band the Dap-Kings Sharon Jones; and painter, sculptor and filmmaker Margo Pelletier.

Echolocation explores aspects of environmental art, especially the use of bioacoustics in sound art and musical composition. The show dwells at the junction between art, science and natural sound, and features works by artists working in the fields of soundscape studies, deep listening and acoustic ecology. Featured composers include R. Murray Schaffer, Doug Quin, Lisa Walker, Hildegard Westerkamp, Pauline Oliveros, and others. Each quarterly program includes news and updates from fields related to scientific and artistic studies of environmental sound. Submissions of locally recorded and produced pieces are encouraged. https://www.facebook.com/EcholocationWGXC