Why don't I have a custom title by now?!
Oh yes, st. alfonzo's boundless research and Doom philosiphy versus Tarnsman's experiences from actively playing, mapping, and enjoying Doom creates a great dynamic between the two. I couldn't have picked better spokespeople for the show myself if I tried!
To addon to the music analogies, I like to consider doom maps into subgenres of one single thing, like I like punk music, but within punk music there's hardcore punk, street punk, ska-punk, crack rock steady, noise, d-beat, crust punk, crust grind, grindcore, etc.
To the average person, pretty much all of those genres can be considered punk or grindcore or metal or just loud noises, but if you're familiar enough with it, the subgenres are very discernible. And with doom, if you haven't had a lot of experience playing it, pretty much everything can be classified as straight Doom maps, and it takes a lot of experience, study, and research into these maps to categorize them into their own things.
BTW there's a comments section on doomradio.org that oughta get used more often :)