"The Birth of Petey Wheatstraw" From Seeds with G.A.M.
But Blu also took that instrumental and spit some on it, however i think it was without green light from Madlib. the whole "Blu-Madlib" shit was on the net for a short period of time, and unmastered as always, however if you were quick backl then you could DL it from bandbase or Soundcloud... can't remember which! . I must stress tho' i DON'T condone DL's and shit.