Panel 1: Daniel, unsure of what to do, has a worried expression on. He says, hesitantly, "Um..." Off-panel, the crowd yells, "Hey, why'd you stop? When's my song?"
Panel 2: Realizing what he's done, Denver half-grimaces, half-smiles, and says under his breath, "Oh, shit..."
Panel 3: Recovering quickly, Denver looks back to Daniel and says, "Uh... do you... do you know any Black Sabbath?