This is a test of the player. Is your browser throwing errors saying the domain bktrks.co is not allowed?
Here's just the link for the next one: https://bktrks.co/t/8ef8e19a5c86b8ee/https://dts.podtrac.com/redirect.mp3/kut-podcast.streamguys1.com/atxplained/073-PostOffice.mp3