On Kanye West's Album "Late Registration", did he sample previously
existing music for "Touch the Sky", "Gold Digger", and "Drive Slow"? 
And if so, what songs did he sample?

The part that Jamie Foxx sings in "Gold Digger" is based on "I Got A
Woman" by Ray Charles.


MTV.com
Road To The Grammys: The Making Of Kanye West's 'Gold Digger' 
http://www.mtv.com/news/articles/1522995/20060201/west_kanye.jhtml
"The idea to make Jamie Foxx a part of "Gold Digger," which had
initially used a sample of Ray Charles' "I Got a Woman," came after
West went to see "Ray" with his friend John Mayer."



You can hear a clip of "I Got a Woman" by Ray Charles at the following link:


Amazon.com
The Very Best of Ray Charles
http://www.amazon.com/gp/product/B00004R5ZP/qid=1143599857/sr=1-4/ref=sr_1_4/104-0531796-5999955?s=music&v=glance&n=5174



Although I like Kanye West and Jamie Foxx, I must say, I prefer the original.


Googlenut

"Touch the sky" uses the sample by Curtis mayfield "Move on up"
and Drive slow also uses a sample but I'm not sure what, a friend
pointed it out to me while we listening to it, and Tupac also used the
sample in a song called
"Shorty wanna be a thug"

I have just found out the name of the sample for Drive slow and it is
Hank Crawford "Wildflower"