Is it an earworm or an icon? The Super Mario Bros. theme is the soundtrack to many childhoods and has remained resonant today. Recently inducted into the Library of Congress’s National Recording Registry, the song was not easy to write. Video game composer Koji Kondo faced musical and technical challenges in creating the song. Columnist Ben Cohen talks to New England Conservatory musicologist Andrew Schartmann about how Kondo created this lasting and genre-changing piece of music. What do you think about the show? Let us know on Apple Podcasts or Spotify, or email us: FOEPodcast@wsj.com  Further reading: The Mind Behind the Music You Can't Get Out of Your Head  Learn more about your ad choices. Visit megaphone.fm/adchoices