Rap is old, and so are you -- 25 years ago today (that's 1979 for you math-o-phobes), rap music broke through into mainstream pop culture with SugarHill Gang's single "Rapper's Delight." The BBC has put together this interactive timeline of hip-hop's rise to utter domination of the zeitgeist. It's entertaining, though not exhaustive: where are the ladies, from Salt-N-Pepa to Queen Latifah to Missy Elliot? Word.