Melvyn Bragg has been satirised for being pompous, but as the presenter of In Our Time I have always found him to be a good proxy for the listener: inquisitive, attentive, and engaging.
The format of the programme (this is BBC radio – it is not a “show”) is simple: three experts on a subject talk about the development of an idea from its earliest appearance to the end of its time, and then describe its impact on modern thinking. The subjects are varied, and range quite frequently from the history of a particular battle (eg Thermopylae) to a scientific theory (eg evolution) and then on to a particular book (eg Dubliners).
I enjoy listening to this show enormously, and have done ever since it started airing after Melvyn Bragg’s elevation to the House of Lords, back when I could listen to it live on the radio, but I point it out here because it is such a terrific source of ideas: want to know what it might have been like to live in a plague-ridden Europw? There is an episode about that. Interested in the development of theories of particle physics? That has been covered occasionally.
So, off you go. There’s hundreds of hours of fascinating radio to listen to there, and only some of it unlistenably pompous.