Twenty summers ago, Young MC's "Bust A Move" was inescapable, a G-rated funk-bomb integral to hip-hop's eventual mainstream acceptance. Fueled by a sample-heavy production, Flea's popping bassline, and infectious rhymes written in a University of Southern California dorm by economics major Marvin Young, "Bust A Move" helped usher in the era of pop-rap — songs squeaky clean enough for the whole family and infectious enough to bombard Billboard.