On that spacecraft, NASA placed a gold record that includes greetings in 55 languages, a collection of "sounds of Earth" (includes babies crying, various animals sounds, "Per aspera ad astra" in Morse Code, sounds of nature, and the like), Ann Druyan's brainwaves, over 100 images....and music.
The music includes Bach's "Brandenburg Concerto No. 2 in F, First Movement", "El Cascabel" by Lorenzo Barcelata , "Johnny B. Goode" by Chuck Berry, Gorō Yamaguchi's "Tsuru No Sugomori", Mozart's "Die Zauberflöte, Queen of the Night aria No. 14 - Der Hölle Rache kocht in meinem Herzen", Peruvian panpipes & flute, "Dark Was the Night, Cold Was the Ground" by Blind Willie Johnson, and much more.
You can see the entire list of music at JPL's page dedicated to Voyager's music, and Jeffrey Salazar has created a wonderful playlist on youtube of it all, while the official NASA Soundcloud list features much (but not all) of the content.
The video embedded below is from Mr. Salazar's playlist.