What is the oldest recorded sound in history? For over 100 years researchers thought they knew until a mind-blowing discovery by historians found something new - and technological advances allowed it to be played back for the first time in history. What is the oldest recording of a musical performance, president, battlefield, television broadcast, cell phone call, and more? Featuring Patrick Feaster, co-founder of FirstSounds.org, three-time Grammy nominee, and Ph.D. in Musicology as well as Lynn Novick, award-winning filmmaker, and co-directing partner of Ken Burns.  Twenty Thousand Hertz is produced by Defacto Sound. Subscribe on ⁠⁠⁠⁠⁠⁠⁠⁠YouTube⁠⁠⁠⁠⁠⁠⁠⁠⁠ to see our video series. If you know what this week's mystery sound is, tell us at ⁠⁠⁠⁠⁠⁠⁠⁠mystery.20k.org⁠⁠⁠⁠⁠⁠⁠⁠. Support the show and get ad-free episodes at ⁠⁠⁠⁠⁠⁠20k.org/plus⁠⁠⁠⁠⁠⁠. Follow Dallas on ⁠⁠⁠⁠⁠⁠Instagram⁠⁠⁠⁠⁠⁠, ⁠⁠⁠⁠⁠⁠TikTok⁠⁠⁠⁠⁠⁠, ⁠Facebook⁠, and ⁠⁠⁠⁠⁠⁠LinkedIn⁠⁠⁠⁠⁠⁠. Join our community on ⁠⁠⁠⁠⁠⁠Reddit⁠⁠⁠⁠⁠⁠. Episode transcript, music, and credits can be found here: https://www.20k.org/episodes/soundfirsts Learn more about your ad choices. Visit megaphone.fm/adchoices