This month at Complex magazine, Chairman Jefferson Mao counts down the thirty greatest hip-hop demos of all time — including dustily sparkling gems from Lord Finesse, Jay-Z, Tha Alkaholiks (formerly known as ESP: Everyday Street Poets), Hieroglyphics, Eminem, Big L, Brand Nubian, O.C., Mobb Deep (f/k/a Poetical Prophets) Ras Kass, DJ Shadow, Pete Rock & CL Smooth, and Organized Konfusion (f/k/a Simply Too Positive), Nas, and Public Enemy. The list includes sound clips and Mao's ridiculously well-informed commentary — a must-read for fans of '90s hip-hop. Click here to check it out.