Canadian composer and guitarist Tim Brady told me about the European music entrepreneur who came up after one of his concerts and said, “I love listening to your music, it makes me feel so happy.” Later the entrepreneur organized a music festival, and explained to Tim why he didn’t include him: “After all, this is a serious music festival.”

The idea is that if you rank any phenomenon according to frequency, such as book or record or beer sales, you get a distribution graph with a vertical part that curves into a horizontal part. For instance – and I take this example from Wikipedia –