Carl Sagan / Stephen Hawking gets Autotuned
 

and it actually sounds good (as in not gimicky):

http://www.youtube.com/watch?v=zSgiXGELjbc

Re: Carl Sagan / Stephen Hawking gets Autotuned
 

Wow. Cool. Moving.

You can estimate the popularity by the fact that, at the moment, there's not a single negative statement about the track among the first 10 comments on YouTube (some mild criticism is broadly directed at the language, but that's not really a fault of the originator of the vid). I cannot remember having seen such a thing before. Still, "only" half a million views.