[Update: I thought those CD prices were a little exorbitant! They are pre-order bonuses for the game, so the CD will come bundled with the software. That makes sense!]
When it comes to guilty pleasures, jamming out to some of the recent Sonic soundtracks ranks way, way, waaaaaay up there. Yeah, I've got a few Crush 40 tracks on my Zen, big whoop, wanna fight about it?
The music of Sonic Generations, a collection of arranged tunes spanning the Blue Blur's career, might be a little more palatable to you. To that end, I'm pleased to inform you that Sega will release two versions of the game's soundtrack, History of the 1st Stage. The White Version will cover the zones featured in the HD game, while the Blue Version will cover the zones featured in the 3DS one.
Currently, Amazon Japan is listing the White bundle for 6230 yen (about $80) and Blue bundle for 4445 yen (about $57). If those prices don't scare you, though, I bet the shipping will. Those bundles include the game and the CD.