23. Joe Budden
Major Hit: "Pump It Up" (2003)
Other Hit: "Fire" f/ Busta Rhymes (2003)
Though he's now a member of the rap supergroup Slaughterhouse and become an underground favorite with his Mood Muzik mixtape series, Joe Budden will forever be remembered for his solo hit "Pump It Up." Yet contrary to popular belief the New Jersey spitter has sent not one but four solo joints into the Billboard charts, the biggest being "Fire" his collabo with Busta Rhymes—and let's not even mention his feature appearances with Marques Houston and Christina Milian. Really, let's not.