Here's the Spotify playlist: Voyager Golden Record (28 tracks, total time: 1 hour) Spotify is also ridiculously good for world music, thanks to the great field recordings collection from the Smithsonian label. I substituted a few tracks which I couldn't find exact matches, with the closest thing I could get. Check out this Nasa page for the full original tracklist.
And before the Voyages see the light of a new sun, all they can hear is some ultra-cool electronic music as in this video below. Gosh, what an attack of homesickness this sound can provoke!