But! There's sci-fi music that's far more outlandish, way creepier, and much more authentic. Don't believe me? Listen to the following two videos (no need to watch 'em). They were recorded by Voyagers I and II, which took electromagnetic readings as it passed through the outer solar system.*
sound of Neptun
Uploaded by bornovali. - Technology reviews and science news videos.
Want more? There's another video in the Gizmodo piece below, and a standard Google search along the lines of "Voyager Symphonies of the Planets YouTube" gets a number of videos as well.**
** YouTube also has numerous videos of theremins, including a guy playing the Super Mario theme. :)