Episodes list — Twenty Thousand Hertz - The stories behind the world's most recognizable and interesting sounds.
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The Buzzer: Are there secret spy messages on the radio?

The Buzzer: Are there secret spy messages on the radio?

Since World War I, countries around the world have been broadcasting mysterious numerical messages via shortwave radio. Though concrete evidence is hard to come by, the general consensus is that these coded messages are meant for undercover agents operating abroad. And one particular Russian station may have an even more sinister purpose. Featuring computer engineer Andrus Aaslaid, historian Maris Goldmanis, and documentary photographer Lewis Bush.

Stay Tuned: The new voices of the Looney Tunes

Stay Tuned: The new voices of the Looney Tunes

Nearly a century after they first appeared, the Looney Tunes are back in an all-new series. To bring this iconic franchise into the present, the creators are looking to its past, taking it back to the look and feel of the 1940s. But filling the shoes of legendary voice actor Mel Blanc is easier said than done. Featuring voice actors Eric Bauza and Jeff Bergman, and showrunner Pete Browngardt.

Inside the Foley Prop Room: Frozen, Jurassic Park & more

Inside the Foley Prop Room: Frozen, Jurassic Park & more

In part 2 of our exploration of Foley, the Warner Brothers Foley team takes us into the all-important prop room. Along the way, they demonstrate how they make the sounds for flapping birds, breaking bones, cracking ice, handling guns, and more. Featuring Foley Artists Alyson Moore and Chris Moriana, and Foley Mixer Darrin Mann.

The Art of Foley: Bringing Slimer & Batman to life

The Art of Foley: Bringing Slimer & Batman to life

When it comes to film sound, "Foley Artist" might be the most important job you've never heard of. These performers record custom, synchronized sound effects to create the sounds for characters' footsteps, movements, and much more. It's exhausting and delicate work, and when it's done right, the audience doesn't even notice it's there. In this episode, we tour the Warner Brothers Foley stage with Foley Artists Alyson Moore and Chris Moriana, and Foley Mixer Darrin Mann.

Leaky Pipeline: The fight that revolutionized cinema sound

Leaky Pipeline: The fight that revolutionized cinema sound

In the late 80s, a small French company found a way to pair analog film with pristine digital audio. But getting their system into theaters would involve a long legal battle, hiding out in a Vegas bathroom, and a last-ditch meeting with a famous director. Their struggle is part of a larger narrative about the groundbreaking work of women in the field of professional audio. Featuring audio engineer Leslie Gaston-Bird and LC Concept co-founder Elisabeth Löchen.

Auditory Icons: Credit card beeps to driverless car melodies

Auditory Icons: Credit card beeps to driverless car melodies

We live in a designed world, and alert tones are no exception. Every beep and ping that your phone or laptop makes probably went through multiple rounds of revisions and approvals. So what separates a good device sound from a bad one? This story comes from the Wireframe podcast, and features sound designer Connor Moore and psychoacoustic expert Susan Rogers.

Progression Obsession: Pop music’s most used chord changes

Progression Obsession: Pop music’s most used chord changes

There are a few specific chord progressions that show up again and again in popular music. Across hundreds of hit songs, the same basic musical formulas have been used by artists ranging from Lynyrd Skynyrd to Lady Gaga, and from Bob Marley to Blink-182. So where did these musical tropes even come from, and what makes them so enduring? Featuring music journalist Jennifer Gersten and comedic musician Benny Davis.

SM7: The mic that shaped sound and culture

SM7: The mic that shaped sound and culture

Since their founding almost a century ago, Shure has created some of the most iconic microphones ever made. In this episode, we worked with Shure to tell the story of the SM7 dynamic microphone: from its humble beginnings in voiceover studios in the early 70s, to its use on classic albums, to its rediscovery by podcasters and streamers.