Interactive Music Engine
Tom Bailey's interactive music changes based on what's going on in the game, but it also functions in an "endless music generation" mode if you close the lid and plug in headphones or speakers. Never the same music twice, and you can listen for many hours before you'll hear all the great moments that his music has to offer.
Soundtrack Anthology (Kickstarter Exclusive)
Yes, the game has a fully-interactive soundtrack, but that won't work on your MP3 player. We've assembled a collection of linear music to suit that purpose---original demos, musical sketches, outtakes, and remixes. Hear the six original musical sketches that served as inspiration for some of the interactive tracks that made it into the game (you can listen to two examples above). Tom has also arranged a bunch of remixes and other interpretations of the music in the game. You'll even get to hear stuff that didn't end up in the game for one reason or another.
The Soundtrack Anthology will be a private, exclusive digital download for Kickstarter backers who receive the Limited edition or who pledge a bit extra for the regular edition. The material in the Anthology will never be publicly available after the Kickstarter campaign.