The band I sing with was performing tonight and my Freds came to have dinner with me in between sound check and start of show (5 doesn't usually come because it is much loud for his baby ears!).
I remember when I was very young, not as young as 5, but little, when we were out to see our friends who had a band and the lead singer brought me up on stage and held me at the microphone in front of the lights and the audience and I loved it.
Naturally, I had to do the same for 5 (although I have no intention of being any kind of stage mom), and he was super into it. Really, what is there to not be into? You walk up stairs, there are cords everywhere and breakable things too!