burp in the symphony

My jolly girls have coined a new phrase - a burp in the symphony. I have no idea what it might mean in the mind of a 4 or 6 year old, but it's used in a rather grand way. I try to imagine a burp that interrupts a symphony and love the way it tackles my serious thoughts, turns on the happy glow and just spreads an inner grin somewhere deep in the body...

I can already see how useful this phrase is...
This week turned out to be a bit of a burp in the symphony.
People in groups. There's always someone who turns out to be a burp in the symphony.
It's just begging to have some art created just to be able to use it as a name. 

Ah kids!