Nujabes did a ton of songs for Samurai Champloo. If your into him, I highly suggest checking the show out. Its from the guy who made Cowboy Bebop too. So you know its good
His dismal and euphoric tones are a perfect mate with the struggle and pain contained within the lyrics of many of history's best rap artists:
more:
Nas My country(dope, REAL lyrics) over Nujabes' counting stars:
there is literally thousands of other Nujabes mashups. some good, some not. here is another:
Nas Book of Rhymes blended w/nujabes
Common-the light blended with Nujabes(seriously one of the most beautiful rap songs ever made and it never would have happened if it werent for the internet)