Thunder Underground is a hard rock and heavy metal interview podcast hosted by Trent, and by episode 456 the shape of it is fully settled. One or two musicians come on. They talk about a new album or single, how it came together, what the band sounded like before, and what is planned next. There is no panel, no co-host banter, no segment clock. Just a long conversation with someone who makes the music. Recent guests give a fair picture of the range. Mike Fitz and Tommy Skio came on for Bad Marriage's third full-length album Match Made in Hell, the first with Tommy on board, with some Tesla history worked in along the way. Jason Sheff and Jay DeMarcus discussed Generation Radio's second album Take Two, a pairing Trent himself flagged as something he never expected to introduce. Holly West and Fred Aitching of the power trio Dead Groove talked about their remake of the Jimi Hendrix Experience track Voodoo Child, which features Steve Morse on guitar. Joe Defiant covered his band's old music, new music, sound, and future. Dave Anthony brought Ten Ton Mojo's current single and recent catalogue. Philip Shouse discussed a new solo EP, his work with Accept, and his time with Ace Frehley. The interviews get into craft. A guest explains why a track leaned toward a Led Zeppelin III kind of acoustic jangle, and why he was fine letting it land there. That is the level the show operates at, musician to fan, without the promotional gloss that bigger rock interview shows tend to carry. Trent opens most episodes himself, sometimes wandering off on a tangent about sequential episode numbers before catching himself and getting to the point. That looseness is part of the appeal. So is the geography. Tulsa is everywhere in this show, from a Midtown tattoo shop that has inked members of well-known metal bands, to a longtime area concert promoter whose booking history reads like a hard rock touring almanac. Sponsor reads run long and are delivered with genuine affection rather than obligation. Listeners looking for a tightly produced, heavily edited music show should look elsewhere. This is closer to a regional scene institution that happens to publish as a podcast, with a back catalogue deep enough that any hard rock fan will find a band they already love and several they have not heard yet.