The Who had a record that instructed listeners to play it loud. At the environmentally oriented, field-recording intensive podcast series touchradio.org.uk, the analogous instruction is a tidy Headphones recommended.
Entry 34 in the series, recorded by Diane Hope, is an M4A file (essentially an MP3 with images encoded) caught in the desolate Northern Arizona high country, where on the hunt for frog calls she came upon all manner of other beasts, including an elk whose call she likens as follows: “it’s as if an avant jazz musician is blowing overtones through his trumpet mouth piece.” She couldn’t be more right.