I think Lovefool is asking about the moonwalk tune from the pickle not the toxic moon music. Currently, I do not know if there's a way to extract that tune. Here are the available ones that were released by Glitch: www.glitch.com/blog/2010/12...
It may be possible to snag a copy of that track if you've got the Network tab open in Chrome's Developer Tools console while the track is playing somewhere (in-world) that you can hear it. I forget who originally let on about that method, but it's worth a shot if you know anyone who'll play it for you in-game...