Downloaded from: http://primarynotes29.blogspot.com/2013/07/timed-scramble.html
Bring a timer. Have the lyrics on pieces of paper in scrambled order. Choose a class. Tell the children to put the lyrics in the right order. Time them, take note of the time. Sing, then move on to the next class. See which class has the fastest time.
*Idea from Heidi W. in the LDS Choristers Facebook Group