Even that article I quoted provided a study done by a union, which indicates the pay discrepancy when accounting for everyhing is about 5 cents - and that very well may not be related to any form of discrimation.
"Groups with guitars are on the way out, Mr. Epstein"
Dick Rowe, A & R man
"I believe in a Spinoza's God who reveals himself in the harmony of all that exists, but not in a God who concerns himself with the fate and actions of human beings."
--Albert Einstein, 1929