It’s a great business that manages to stiff its customers (us) and its employees (musicians). An oldie but a goodie to help you understand. Summary:

The band is now 1/4 of the way through its contract, has made the music
industry more than 3 million dollars richer, but is in the hole $14,000
on royalties. The band members have each earned about 1/3 as much as
they would working at a 7-11, but they got to ride in a tour bus for a
month.