If you're a fan of Portal, chances are you already have some of the best songs the series has to offer on your playlist like "Still Alive" and "Exile Vilify". But just in case you're missing any, or you want some sort of physical disc collection that looks good in your CD case, you're in luck.

Valve has announced that it will be releasing a special 4-disc Portal Collector's Edition Soundtrack at the end of October, which will include a number of great songs from both the original Portal and its sequel including Jonathan Coulton's full song set. In addition, you'll also be able to snag a special collector's comic book, Turret Lullaby. Though we're not able to tell what the contests are, we're guessing that turrets will be involved... or combustible lemons.

If you want a sampler of what's going to be on the compilation, head over to Portal's dedicated music page and give a listen. Meanwhile, we're gonna go get cake. Link: http://www.thinkwithportals.com/music.php