Knowing this podcast feels like a rock and roll band who wrote journals/sending letters to the fans while doing a band tour, I think a postage stamp would represents the podcast. So the concept is mainly to bring the retro postage stamp look theme as a logo, with its tall and bold slab serif font. These characteristics can also be recognised as a rock and roll theme, plus a frame which could be recognised as a postage stamp used on letters/postcards (or spoken letters, which is podcasts).
#37, #39, #41, #45 are the basic version of this concept, banners and rotated ampersand supports the "rock and roll" feel.
#38, #42, #43, #44 are having a birdcage microphone on the top of the text, this is to symbolise "podcast" and rock and roll music in general.
Feedbacks for revisions and ratings are appreciated, thank you for your consideration.
P.S.: Thank you for opening a contest here. I just discovered The Moody Blues through this contest and glad that this is kind of band I'd like to listen to (Shame on me, it's too late, I know).