Snake will find songs to put on his I-pod as the game progresses. The following songs have the corresponding effects on game play.
Beyond the Bounds Effect: Increases stun damage done by snake from non-lethal weapons Location: Stage 4 shadow moses, tank hangar. After power is restored, backtrack to the upper catwalk and explore all rooms.
Big Boss Effect: Increases stun damage and increases snake's accuracy How to unlock: Earn the big boss emblem
Bio-hazard Effect: Cause soldiers held by snake to scream in terror. Location: Stage 3 europe, midtown.
Destiny's Call Effect: Cause soldiers held by Snake to become enraged. How to unlock: Received randomly as a gift from a militia or rebel soldier when snake gives them a healing item.
Flowing Destiny Cause soldiers held by snake to cry Location: Stage 4 shadow moses, canyon. Before leaving the canyon area, examine the rocky walls for a hole hiding this item.
Fury, The Effect: Cause soldiers held by snake to become enraged. Location: Stage 2 south america, cove valley village. Inside the fire ravaged house.
MGS 4 Love Theme / Action Effect: Causes soldiers held by snake to cry. How to unlock: Received randomly as a gift from a militia or rebel soldier when snake gives them a healing item.