Snake's iPod can download specific tunes throughout the course of the game. Some songs have an additional "secret" effect when it is played in the game.
| Tune | How to unlock
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| Beyond the Bounds (increases stun damage done by Snake from non-lethal weapons) | Stage 4 Shadow Moses, Tank Hangar. After power is restored, backtrack to the upper catwalk and explore all rooms
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| Big Boss (increase stun damage and increases Snake's accuracy when played) | Earn the Big Boss emblem
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| Bio-hazard (cause soldiers held by Snake to scream in terror) | Stage 3 Europe, Midtown
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| Destiny's Call (cause soldiers held by Snake to go enraged) | A random gift from a militia or rebel soldier if Snake gives them a healing item
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| Flowing Destiny (cause soldiers held by Snake to weep like a little girl) | Stage 4 Shadow Moses, Canyon. Before leaving the canyon area, examine the rocky walls for a hole hiding this item
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| Fury, The (cause soldiers held by Snake to go enraged) | Stage 2 South America, Cove Valley Village. Inside the fire ravaged house
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| MGS 4 Love Theme / Action (cause soldiers held by Snake to weep like a little girl) | A random gift from a militia or rebel soldier if Snake gives them a healing item
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| Opening - Old L.A. 2040 (increase Snake's accuracy) | Stage 4 Shadow Moses, Nuclear Warhead Storage B2. Input 78925 into Otacon's lab computer
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| Policenaughts Ending (cause soldiers held by Snake to fall asleep on touch) | Stage 4 Shadow Moses, Nuclear Warhead Storage B2. Input 13462 into Otacon's lab computer
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| Rock Me (increases Snake's amount of life recovered from items and other means) | Stage 2 South America, Confinement Facility. Island in the south-eastern quadrant
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| Sailor (increases Snake's amount of life recovered from items and other means) | Stage 2 South America, Vista Mansion. Between the east wall and a cargo container
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| Show Time (cause soldiers held by Snake to scream in terror) | A random gift from a militia or rebel soldier if Snake gives them a healing item
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| Snake Eater (increase the life recovery rate of Snake through items and other actions) | Unlocked by earning all 40 game clear emblems
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| Subsistence (increase Snake's accuracy) | Play at least one game of Metal Gear Online. You must start the match with at least two players
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