You sure this was on a CD? Sounds more like a digital form to me...
Quote:
The Humble Indie Bundles or Humble Bundles are a series of game bundles that are sold and distributed online at a price determined by the purchaser. The games are multi-platform, DRM-free........
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http://en.wikipedia.org/wiki/Humble_Indie_Bundle
...and also according to wiki, every game (except Avadon) from the Android 2 bundle had soundtrack included, not only Snuggle Truck.
http://en.wikipedia.org/wiki/Humble_..._for_Android_2