Very simple trick to make your choir’s sound brighter if it’s dull – or if it’s placed a bit far back in the mouth.
Have the choir sing a section of the song (for comparison later)
Sing the same section the way Jerry Lewis would sing it. Yep – nasty nasty nasty. The younger choir members may have to look him up on youtube before attempting this.
Then sing the same section for a third time in what will feel like the usual, relaxed way.
The sound will be brighter and more exciting, (without any of Jerry’s tension in the mouth or throat).