Def Jam: Icon (Xbox 360)

It's Goin Down
To unlock this track, go to the start screen and enter B, UP, RIGHT, LEFT, Y.

Make It Rain
This is another track. Unlock it by hitting Down, B, A, Right at the start screen. (Though there seems to be one input missing - can someone confirm?)

Fat Joe
To unlock Fat Joe, enter DOWN, B, A, RIGHT at the start screen.