Roger,
Yes, that is a bit odd for a 5-year-old to be writing. We have a local bar that has early shows. Our neighbor plays from time to time and there are often 6-10 pre-teen kids running around during the show. We originally named the bar in the lyrics, but I told him that people who didn't live around here wouldn't understand what "Going to the Cave tonight" meant. So, he agree to change the lyrics to be more generic. Probably more than you wanted to know, but now you know.