Here is the list of Ipod songs you can obtain through out the game. Some Ipod song has some effect while some doesn’t. Do take note that Ipod songs will be lost once you completed and replay your game and must be obtain all over again.

Song: Inori no Uta
Location: Act 1 Mission Briefing
Details: Play this briefing from the main menu and use the Mk. II to find it upstairs in the kitchen/living room area, near the table.

Song: Theme of Tara
Location: Act 1 - Militia Safehouse
Details: In an alcove to the left immediately after the room with the injured rebels.

Song: Zanzibarland Breeze
Location: Act 1 - Urban Ruins
Details: Right when you reach the very end of the ruins, facing the drop point, turn left. Crouch to enter this area with the dead soldier, then stand up again. There will be a ledge you can see here. Climb up and you can find the song.

Song: Level 3 Warning
Location: Act 1 - Advent Palace
Details: In the kitchen area on the 3F, guarded by a Claymore.

Song: Theme of Solid Snake
Location: Act 1 - Millennium Park
Details: Down the road from where the two PMCs are and near a third is an alley with a dumpster. Slip into the building here and the song is immediately to the right.

Song: Destiny's Call
Location: Act 1 or 2
Details: Random gift from rebel soldiers when they are given items. Keep giving them items until they relinquish this.

Song: Show Time
Location: Act 1 or 2
Details: Random gift from rebel soldiers when they are given items.
Effect: Grabbing enemies with CQC makes them scream

Song: MGS 4 Love Theme/Action
Location: Act 1 or 2
Details: Random gift from rebel soldiers when they are given items.
Effect: Grabbing enemies in CQC causes them to cry

Song: Boktai 2 Theme
Location: Act 2 Mission Briefing, Nomad
Details: Go upstairs with the Mk. II. It's in the bathroom.

Song: The Fury
Location: Act 2 - Cove Valley Village
Details: Inside the house with the porch
Effect: Grabbing enemies with CQC makes them feel rage.

Song: Metal Gear 20 Years History (Part 3)
Location: Act 2 - Confinement Facility
Details: In the large facility itself, in the barracks (room with all the beds) you will find this song.

Song: Rock Me Baby
Location: Act 2 - Confinement Facility
Details: In the "countryside" part of the Confinement Facility, it's on the centermost island of the bog area. The island is large and has a lot of rocks on it, the song is on the middle plateau, right in front of two rocks.
Effect: Increases Snake's recovery rate

Song: Sailor
Location: Act 2 - Vista Mansion
Details: In the top right when just entering the gateway to the mansion. Find it in the area with the tents in the top right between the wall and a large red container.
Effect: Increases Snake's recovery rate

Song: Bon Dance
Location: Act 2 - Marketplace
Details: It's more or less in front of you when you begin this area. Might be obstructed by some market stalls and also beware of the Gekko.

Song: Shin Bokura no Taiyou Theme
Location: Act 3 Mission Briefing, Nomad
Details: Go upstairs with the Mk. II. It's near the stove, where Snake is standing at the start of this briefing.

Song: Test Subject's Duality
Location: Act 3 - Midtown S Sector
Details: Immediately when you get control following the cutscenes.Turn around and go back to the previous street, turning left. You can find it near the building here

Song: Biohazard
Location: Act 3 - Any Midtown area
Details: Hold up and search the resistance member

Song: One Night in Neo Kobe City
Location: Act 3 - Midtown S Sector
Details: When facing the park in the first area, go down the street to the right and you should find a lone PMC. Hold him up for this song.
Effect: Holding enemies in CQC makes them laugh

Song: On Alert
Location: Act 3 - Midtown N Sector
Details: Follow the last PMC to be walking with the disguised resistance member and he will enter an alley with this song inside

Song: The Essence of Vince
Location: Act 3 - Echo's Beacon
Details: Before the boss fight with Raging Raven ends, find it on the top floor in one of the corners

Song: Lunar Knights Main Theme
Location: Act 4 Mission Briefing, Nomad
Details: Go upstairs with the Mk. II. It's right next to where Sunny is

Song: Warhead Storage
Location: Act 4 - Tank Hangar
Details: At the end of the 2nd floor vents; take the upstairs vents from the Heliport and crawl all the way through.

Song: Flowing Destiny
Location: Act 4 - Canyon
Details: Near the exit, to the far left is a small crawlspace in the rocks. The song is inside here
Effect: Grabbing enemies with CQC causes them to cry

Song: Metal Gear 20 Years History (Part 2)
Location: Act 4 - Warhead Storage BLDG B2
Details: After getting off the elevator, turn right immediately. Go through the office area to the far end. The song is tucked away in the corner

Song: Opening - Old L.A. 2040
Location: Act 4 - Warhead Storage BLDG B2
Details: When asked for the password in Otcaon's office, input 78925
Effect: Snake's accuracy is increased

Song: POLICENAUTS End Title
Location: Act 4 - Warhead Storage BLDG B2
Details: When asked for the password in Otacon's office, input 13462
Effect: Enemies held by Snake in CQC are automatically put to sleep

Song: The Best Is Yet To Come
Location: Act 4 - Snowfield
Details: After the Crying Wolf battle, in the small area that Otacon unlocks, the song is immediately to the right after entering. It's the same area that the "Disc Change" Codec call occurs.

Song: Beyond the Bounds
Location: Act 4 - Tank Hangar
Details: After power is restored, return to this area and the bottom-right door on the 2nd floor will be unlocked then go in.
Effect: Increases the effectiveness of non-lethal weapons.

Song: Yell (Dead Cell)
Location: Act 4 = Casting Facility North

Song: Metal Gear Solid Main Theme (The Document Remix)
Location: Act 5 - Ship Bow
Details: Under a hatch right near Snake when you start this area. Get close to it and open it with Triangle. Slip into this area and crawl through the duct to find the song.

Song: Subsistence
Location: N/A
Details: Play at least one match of Metal Gear Online
Effect: Snake's accuracy is increased.

Song: Big Boss
Location: N/A
Details: Obtain the Big Boss Emblem
Effect: Increases Snake's damage and accuracy.

Song: Snake Eater
Location: N/A
Details: Collect all 40 Emblems
Effect: Increases the rate of recovery by items and other methods.