The contributions to American popular music by Indigenous peoples has been largely hidden because?
1) women are the primary music-makers in First Nations' culture, so they have been shut out of the patriarchal music business
2) the FBI has worked tirelessly to censor any Indigenous musicians who appear to be building a following
3) it all happened before recording technology was invented
4) White musicians appropriated their innovations very quickly so they didn't get the credit they deserved for much of American history
5) it has been more socially advantageous to be Black than to be Native, so many mixed-race musicians tried to pass as Black in order to have a career