Yes, Party Rock Anthem is the background song. If you're wondering why they don't have voices, it's because I haven't even thought of some, and didn't invite anyone to voice them yet. Here are some lines though: P: ''Aha! There you are.'' ''I've been stuck here for about... 10 years now.'' GM: ''10 and a half?? Wow. That's like- a long time.'' P: ''Yeah... it felt almost like... one of those liminal spaces.