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YYZ by Rush fits the bill. YYZ is the international airline short name for some airport in Canada. The main riff you hear at the first of the song is YYZ in morse code.
Lateralus by Tool.
That 10,000 days track is pretty nutty. Googled it for some more info and found this 10 Mind-Blowing Easter Eggs Hidden in Famous Albums | Cracked.com 2 pages of hidden stuff on albums, may be what you're looking for, pretty cool read even if it's not.