DJs are bigger than ever now, and most of them live lives like rock stars; they have performed in large nightclubs, events and fashion shows all over the world. Superstars DJ's like Tiesto, Avicii, David Guetta, and Samantha Ronson all have well established roots, and many aspiring young DJs strive to be as successful. See our picks of up-and-coming DJs, and who is climbing the ranks.