From Slashdot.org, I learned of a posting on a University of Washington webpage that included the above-embedded simulation of the sound of the Big Bang, and the following text.
News and Information
A decade ago, spurred by a question for a fifth-grade science project, University of Washington physicist John Cramer devised an audio recreation of the Big Bang that started our universe nearly 14 billion years ago.
As the universe cooled and expanded, it stretched the wavelengths to create “more of a bass instrument,” Cramer said. The sound gets lower as the wavelengths are stretched farther, and at first it gets louder but then gradually fades. The sound was, in fact, so “bass” that he had to boost the frequency 100 septillion times (that’s a 100 followed by 24 more zeroes) just to get the recordings into a range where they can be heard by humans.
For those who read the comments along the way: