Music for Extraterrestrials: Bach

And Carl Sagan, when consulted about the music that should be sent in the Voyager I space probe to regions where it might reach extraterrestrial intelligence, responded:

I would vote for Bach, all of Bach, streamed out into space over and over again. We would be bragging, of course, but it is surely excusable to put on the best possible face at the beginning of such an acquaintance. Any species capable of producing the music of Johann Sebastian Bach cannot be all bad.