Nightingale

An exercise to warm up, sing in and keep rhythm. Players are divided into two equal groups. Both groups sing the same song as a choir, only with differences in the singing of "Hey! at the end of each line.

Both groups start singing at the same time. Group 1 starts with (from 1x Hey! up to 5x Hey!):

"On a tree in California, there's a little nightingale sitting there singing La La La La, hey!"..."
"On a tree in California, there's a little nightingale sitting there singing La La La La, hey! Hey!"..."
"On a tree in California, there's a little nightingale sitting there singing La La La La, hey! Hey! Hey!"..."
"On a tree in California, there's a little nightingale sitting there singing La La La La, hey! Hey! Hey! Hey!"..."
"On a tree in California, there's a little nightingale sitting there singing La La La La, hey! Hey! Hey! Hey! Hey!"..."
Group 2 starts with 5 Hey and then goes down to 1x Hey, with:

"On a tree in California, there's a little nightingale sitting there singing La La La La, hey! Hey! Hey! Hey! Hey!"..."
"On a tree in California, there's a little nightingale sitting there singing La La La La, hey! Hey! Hey! Hey!"..."
"On a tree in California, there's a little nightingale sitting there singing La La La La, hey! Hey! Hey!"..."
"On a tree in California, there's a little nightingale sitting there singing La La La La, hey! Hey!"..."
"On a tree in California, there's a little nightingale sitting there singing La La La La, hey!"..."
In the last round, both groups should be together on the last "Hey!" end up synchronously together.