NewMexiKen has written about the Voyager spacecraft and the Golden Record here, here and here. But I failed in the past few weeks to note the 30th anniversary of their launches in 1977. Voyager 2 was launched on August 20, 1977 and Voyager 1 on September 5, 1977.
Both spacecraft — now in interstellar space, outside the area where our Sun dominates the environment — continue to send back data. Voyager 1 is further from Earth than any other manmade object and leaving us behind at 38,000 miles per hour.
NASA and the Jet Propulsion Laboratory have a site devoted to Voyager.
And there is a site with the recordings on the Voyager Golden Record: Sounds and Music of Earth.
Thanks to John for the last link and the reminder.