To go where no probe has gone before

Voyager 1 has reached the edge of the solar system, 26 years after its launch. NASA provides not only a listing of the golden record's contents, but also includes a Flash page that shares some of the images, sounds, and greetings that are recorded on the disc.

I still recall an early X-Files episode (the second season premiere, IIRC), in which it was mentioned that the first song on the record is Bach's Brandenburg Concerto #2. Since that time, that piece has become one of my favorite musical compositions, and I must concur with the character in the episode, who expressed his pleasure that should any alien intelligence ever happen upon the record, that song will be their first impression of Earth. I can't think of a better one.