All music:
     Hold L + R and press B, X, B, X at the CompStat/Map screen.

Unlock Fight Clubs:
     Hold L + R and press X, X, B, B at the CompStat/Map screen.

Unlock Ghetto City:
     Hold L + R and press A, X, A, Y, Y, Y at the CompStat/Map screen.

Unlock Puma outfit:
     Hold L + R and press Y, A, B, X at the CompStat/Map screen.

Unlock All Street Fights:
     Hold L + R and press X, X, B, B, X at the CompStat/Map screen.

Unlock All Street Races:
     Hold L + R and press Y, Y, A, A, Y at the CompStat/Map screen.

Zombified:
     Hold L + R and press B, Y, X, A, X, A at the CompStat/Map screen.