A couple of years ago, SUGARLAND... along with touring partners LITTLE BIG TOWN and JAKE OWEN... were closing shows together with a performance of the '80s song "Life In A Northern Town".  A live version even became a minor hit.

Since then it's become kind of a tradition for Sugarland and Little Big Town to do some sort of "surprise song" together in concert.

This time it's the MADONNA song "Like a Prayer"... which they rolled out at their show last Friday in Bloomington, Illinois.

Here's a video of that special moment...