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If you’ve been listening to LeVar's new podcast Sound Detectives, you know there's something irresistible about a missing sound. That’s why we teamed up with our friends at 99% Invisible to tell the story of the first music streaming service, a 200-ton instrument called the Telharmonium whose sound has been lost to history.

99% Invisible is a podcast about the unnoticed design that shapes the world we live in. This is their latest episode, a collection of mini-stories that weren’t quite big enough for a whole episode. You’ll hear about time measured in decimals, a rogue unlicensed Italian architect, and the ghost kitchens that power food delivery apps. And then yours truly, telling the story of the Telharmonium.

Listen to 99% Invisible wherever you get your podcasts and visit 99pi.org for more.