The Kitchen Sisters, in collaboration with Roman Mars of 99% Invisible, offer this fascinating story about illegal recordings of American music etched into old x-rays during the Cold War. Link here.
If you don't know the work of the Kitchen Sisters, well, you're welcome! These trailblazing radio producers have been using sound to tell stories way before everyone and their mother had a podcast. Check out their archive, paying close attention to the series, Hidden Kitchens.