MF DOOM is the man in the iron mask. The most mysterious figure in Hip-Hop has also become one of the most popular, supplying beats and rhymes for Gorillaz, De La Soul, Madlib, Danger Mouse, and Wu-Tang Clan, and drawing praise from heavyweights like Just Blaze, Nas, and Mos Def. Since 2002, DOOM has released numerous volumes of Special Herbs, one of the longest-running instrumental series in Hip-Hop history. With obscure loops and dusty samples galore, Special Herbs Vol. 3 & 4 is a must-have for any DOOM fan or Hip-Hop head.