Emissary have their second single of the year out now. With “Caldera,” the stoner-prog metal band go entirely instrumental, getting loud and clangorous just as the name of the track would suggest. Resonant guitars crash like a volcanic eruption, with midtempo riffage rolling like rivers of lava. We can imagine that this song and previous single “Line of Sight” are the sign of something bigger in the works to come from Emissary, so stay tuned!