Little Brother is playing with Girl Next Door (she's 8). Right now they are playing the organ. This is a classic case of What Boys Do and What Girls Do.
Girl Next Door is trying out the different stops, changing the tone of the organ and making some lovely-sounding combinations.
Little Brother is hanging off the side of the organ bench, yelling, "Help me! It's a volcano! I'm falling into the lava! Can't you see the lava?"