Music not changing w/ script, and no console errors?

Okay, so I have this script that's supposed to change audio when I press the button (as seen in last question), but it doesn't actually change anything, I don't get errors because I forgot the rbxassetid:// at the beginning the first time, no warnings, nothing. The audio also doesn't change. Script:

--script removed

Yeah, that's all, thanks. I already know this works, because I just had it print.