Anything by 2pac. I could list a hundred, but heres my top 15 of Tupac in NO order ...

Picture Me Rollin
Hollar if Ya Hear me
Bury Me a G
Same Song
Starin Through My Rear View
Keep Ya Head up
Temptations
So Many Tears
Hit em up
Troublesome 96
I Get Around
Changes
Toss It Up
Dear Mama
All About U

Honorable Mentions:

Secretz of War
Brendas Got a Baby
Runnin

Note: Some of these are from the Resurrection CD.