NASA has begun posting space sound files to their SoundCloud page. Here's a post showing a few gems and linking to even more space noise, like NASA's page. Now go use that to make your own music.

#audioCountry bonus: Commander Chris Hadfield also has a SoundCloud page which contains a track called "Entering the Bathroom and Starting the Toilet". So now you know how that sounds. In spaaaaaace! This is #audioCountry 023.