So this is what happened when the Internet connection got wonky at the arcade...

I'm not sure what exactly happened at the arcade last night, but after my first song, I got the flying-through-the-clouds screen for a good few minutes, and at the bottom of the screen, it said "Checking..." The song list was reduced to just the five you see in the photo. Eventually the "Checking" became "Not Available" by the end of my session.