Grace Slick of the Jefferson Airplane appeared on the Smothers Brothers network TV show in blackface.
https://www.google.com/search?q=grace+slick+blackface&tbm=isch&source=lnms&sa=X&ved=2ahUKEwjW3vWL3sOAAxXdATQIHd4gANQQ0pQJegQIDBAB&biw=1061&bih=514&dpr=1.51
Different time and different society....................