Clever girl. Okay... here's my suggestion (a bit over the top). "Proud to be an American" don't know who sings it.... or one of the other modern (a bit country) sappy, patriotic songs. I am sort of kidding, but it might set that participation tone, giving tone. I like your thinking!
I want to kick our first PTO meeting into high gear and maybe have a song playing in the background when parents and teachers start arriving to the meeting. It will be off once the meeting gets started. I want to create some high energy without being offensive. I want the parents and teachers to enjoy coming. Any song suggestions???