Music—in space!

The hot instrument of Hollywood sci-fi in the 1940s, 1950s, and 1960s was the theremin. It's a pretty recognizable sound that, I think, got used in sci-fi scores for its eeriness and its "alien" sound. Have a listen:



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
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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.**

* Gizmodo
** YouTube also has numerous videos of theremins, including a guy playing the Super Mario theme. :)