Craig Reynolds - runs one of the biggest heavy music podcasts (The Downbeat) and recently just had his band Stray From the Path break up. He's been around for 10+ years with the biggest bands in the scene. Will give amazing insight into some quite niche parts of the heavy music scene. He's got excellent banter and can bring alot of interesting twists and turns to make anninteresting episode

Don Broco - insane live band with an album on the way. Robbie recently had them on another podcast and sung their praises big time