A singing warm-up for rhythm and vocal energy.
Players split into two equal groups. Both groups sing the same simple song as a choir, but with a difference in how they sing 'Hey!' at the end of each line.
Both groups begin simultaneously. Group 1 starts softly and Group 2 starts loudly. With each line, the volumes switch — Group 1 gets louder while Group 2 gets softer.
The crossover creates a dynamic wave effect that trains group listening and vocal control.