Make It Rain by Fat Joe track:
When "Press Start" message displayed at the title screen, press
Press Down, Circle, X, Right.

It's Goin Down by Yung Joc track:
When "Press Start" message displayed at the title screen, press 
Circle, Up, Right, Left, Triangle.

Unlock Fat Joe:
Activate the above two codes to play as Fat Joe.
Note: You can't save him progress.

Fighting Styles: 
Complete the following tasks to unlock the indicated Fighting Style 
in Build-A-Label mode:

Unlock Beat Boxer: Reach "Mogul" status

 
 
Unlock Black Panther: Reach "Producer" status
 
 
 
Unlock Jah Breaka: Reach "ICON" status
 
 
 
Unlock Street Kwon Do: Reach "Hustler" status

 
 
Unlock Ghetto Blaster: Reach "Hustler" status
 
 
 
Unlock Muay Fly: Reach "Hit Maker" status