Decca Records is looking for the answer to Chuck D's question from "Bring the Noise." Composer Paul Mealor is searching for a voice that can hit a low E, nearly three octaves below middle C, for his latest piece, De Profundis. NPR has a report on the composer, the work and Decca's contest to find someone who can sing it:
Super Bass: Can You Hit This Note?
If you want to work on your technique to be able to hit low notes, check out Breaking Through: From Rock to Opera: The Basic Technique of Voice by Gloria Bennett (MT893 .B46 1994) or Fifty Lessons for the Voice: op. 9: For Low Voice by Giuseppe Concone (MT885 .C656 op.9, S32 low).
If you just want to hear Public Enemy address the issue, you'll find "Bring the Noise" on It Takes a Nation of Millions to Hold Us Back (CD 194).