If you’ll recall, a free and digital three volume soundtrack was released shortly after Portal 2’s launch last April. However, the Collector’s Edition has an all-new fourth CD with 13 tracks from the original game that will be available for the first time.
The Collector’s Edition also comes with an exclusive mini-comic entitled Turret Lullaby, in case you needed even more incentive to pick it up!
Portal 2’s soundtrack is one of the finest in video game music. It has won several awards including the Outstanding Achievement in Original Music Composition at the Interactive Achievement Awards and Best Audio from the 2012 Game Developers Choice Awards.