I can explain it perhaps in a somewhat simplistic way.
Twenty-five or 30 years ago, when a sound recording producer decided to release an album, they recorded it in a studio. Then they found a record company to market it. Then a distributor would supply thousands of music stores that sold records and albums. Since then, those thousands of music stores that sold albums have all disappeared.
What happened? Albums went digital. The digital album ended up with one online distributor and only a few platforms on which to play the sound recording. So we went from a thousand retailers selling a physical album to just a few digital distributors doing business with three or four platforms that control the market. We are faced with a sort of oligopoly—it is not a monopoly, but almost— that controls the business model and prices.
A digital album sells for $10 on iTunes, while a physical album sold for $25 in a music store at the time. You see the difference. We end up with a model where the number of players is reduced to a few—earlier, I mentioned Google, Amazon, Facebook and Netflix—who control the entire business model of the market, who control prices and who impose the business model.