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In space, electromagnetic vibrations exist and can be mapped as sound. These electromagnetic vibrations pulsate in different wavelengths and can be recorded by sepcial equipment in NASA's spacecrafts. The recordings are then translated into sounds that our ears could hear.
Sources:
http://science.nasa.gov/science-news/science-at-nasa/2012/28sep_earthsong/
http://www.nasa-usa.de/mission_pages/cassini/multimedia/pia07966.html
http://www.jpl.nasa.gov/news/news.php?feature=6550
http://www.nasa.gov/vision/universe/features/halloween_sounds.html
http://www.nasa.gov/vision/universe/solarsystem/voyager-sound.html
https://www.nasa.gov/externalflash/sounds-of-space/index.html
https://soundcloud.com/nasa/sets/solar-system-beyond-sounds