@alex And of course there were earlier examples of audio recordings being distributed, often on phonograph records, later cassette tapes.
Arguably one of the ur-fathers of podcasting was Ruhollah Mostafavi Khomeini, who recorded and distributed audiocassettes from France prior to the Iranian Revolution.
Mentioned in his Wikipedia bio:
https://en.wikipedia.org/wiki/Ruhollah_Khomeini#Pre-revolutionary_political_activity
Also covered in 2021 by #OnTheMedia: "The Tapes That Sparked the Iranian Revolution" https://www.wnycstudios.org/podcasts/otm/segments/tapes-sparked-iranian-revolution-on-the-media.