The title track of HS87’s compilation album of the same name, All I’ve Ever Dreamed Of, features singer Robin Thicke on the hook.

Portal 2 players will recognize the sample used – Cara Mia Adio (an original production by Mike Morasky) – from the end of the game.

http://www.youtube.com/watch?v=_kPyGvqNn4Y

The song is about someone telling goodbye to a girl, in this case GLaDOS is saying goodbye to Chell with whom she has a complicated relationship. Due to the intimacy expressed by the lyrics it can be seen as a message from a mother to her daughter.