actually, im writing a paper about this very subject for my african american lit final. i wouldnt call hip hop "modern day blackface" but the same archetypes you see popularized during the minstrel era you can easily identify in the culture due to mainstream american cultural tradition and commercialization of hip hop (the people that control(ed) and consume(d) both minstrelsy and hip hop are the same audience). the paper is far from complete (though i will be bustin ass all this week with other finals) but later on if this post still exists and my ideas are more developed ill holla back.