Credit to Valve foor making such a great game along with it's component inside.

Team Fortress 2 - Archimedes

Minecraft Music Disc Relic - Aaron Cherof

You can download the whole albums here: http://www.thinkwithportals.com/music.php 
Otherwise, you can just download the singular track straight from here.

Portal 2 Soundtrack - Halls Of Science 4

Piano Music Collection 33

Untitled #1

This is the music that plays on the main menu when you finish the single player campaign mode

I do not take credit for this music. Just give the credit to Valve for Portal 2 and this music in the Portal 2 Soundtrack

Portal 2 | Space Phase (Menu Music)

Portal 2 OST - The Part Where He Kills You

Radio Loop

Chapter 10 - The Credits - Turret Opera (Cara Mia Addio)

none of this is by me im just reposting this for  other people to hear

Portal 2 | Space Phase (Menu Music)

Lumanator