An anthropologist decides to investigate the natives of a far-flung tropical island. He flew there, found a guide with a canoe to take him up the river to the remote site where he would make his collections. About noon on the second day of travel up the river they began to hear drums. Being a city boy by nature, the anthropologist was disturbed by this. He asked the guide, "What are those drums?"
The guide turned to him and said "Drums OK, but VERY BAD when they stop."

Then, after some hours, the drums suddenly stopped! This hit the anthropologist like a ton of bricks, and he yelled at the guide: "The Drums have stopped, what happens now?"

The guide crouched down, covered his head with his hands and said, "Bass Solo".