During the process, we had to learn the notes, and for some of us it didn't come easy. When things don't come easy, we have a tendency to say "I can't do this." But Kira, including the actors who could sing was very encouraging. There was no idle chatter. We made adjustments and kept practicing until we got it right. Now everybody is singing!
Confirmation: Never limit yourself and say "I can't" until you try.