I was playing the chamber where GLaDOS vaporizes the companion cubes and when I picked up the companion cube I could have swore I heard it making sounds. Not the fizzler sound, but something else, anyone else catch this?

IT'S ALIVE!!!

Yeah, It's actually a version of the ending Turret Opera eILAfGweI6A

There's a lot of music in this game that ties in with the gameplay elements

The other big example is when you're in the room where wheatley is playing classical music and when you go over the faith plates, an electronic version plays over it

I pulled both the classical music and the techno version from the game files and overlayed them just so I could listen to the techno over the classical without having to jump back and forth on the AFPs.

Sounds a bit like Mozart.

I'm glad you guys spotted it. I was afraid that I was starting to go insane.

It's called "Love as a Construct" and it's in the portal 2 soundtrack.

Interesting title...