Bear McCreary's
blog entry for the finale indicates that it's unlikely that the four revealed cylons are picking up any radio waves from earth.
Quote:
I knew I needed to get some more information before I could begin tinkering with ["All Along the Watchtower,"] and I needed it from the source. I had dozens of questions. What should it sound like? Which version of the song should we reference, if any? Do we want a performer who can sing and play guitar exactly like Dylan? or Hendrix?
I happened to catch Ron Moore in the hallway at Universal and, in a brief conversation, got everything I needed to know. I learned that the idea was not that Bob Dylan necessarily exists in the characters' universe, but that an artist on one of the colonies may have recorded a song with the exact same melody and lyrics. Perhaps this unknown performer and Dylan pulled inspiration from a common, ethereal source. Therefore, I was told to make no musical references to any "Earthly" versions, Hendrix, Dylan or any others. The arrangement needed to sound like a pop song that belonged in the Galactica universe, not our own.
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I'm guessing that the final five being different has a lot to do with something Leoben said in season 1, episode 8, "Flesh and Bone." Rather than saying cylons were created by humans, he insisted that god created the cylons. Maybe that's more true than we realize. (I just happened to come across that today)