There aren't many technical barriers to entry. That dramatically increases competition on the production side. It seems at least some sources are passing those

There aren't many technical barriers to entry. That dramatically increases competition on the production side. It seems at least some sources are passing those savings on to you the consumer. The price of a gallon of gas in dollars has roughly tripled in the last 30 years. The price of a CD has held constant or declined. New technology allows people to get hit singles at a much lower cost. a cassingle would be in the $6 range, now you can get just the one song for a buck. I can't see how revenue could go up with the dramatic decline in costs. It's not diamonds or oil, there's not some scarce resource that can be controlled. Making music is so much fun people do it for free. The technical barriers to doing so are pretty much gone.