A missionary was going in to the most remote section of Africa. He found a native that would take him upstream to a tribe of headhunters cut off from civilization.
In the distance they could hear drums. “What is that drumming?” he asked nervously. The native replied, “Drums okay, but if they stop it would be very bad”. The drums continued for 3 days as they got closer to the headhunters’ village. Then without warning the drums suddenly stopped. The forest fell eerily silent. With panic in his voice, the missionary calls out to the guide, “The drums have stopped! What happens now?”
The guide crouched down, covered his head with his hands and with despair in his voice, answered, “key change!!”.