Voices of Liberty, 4 female, 4 male 'main' singers, the green 'tree' are all Disney CM volunteers, different for many of the performances, the yellow sides are high school choirs, each different for each and every show. About 24,000 performers rotate through the month it plays. I think it one of the Christmas trip highlights every year, Bet. Saw it twice this year, once with a couple DIS'ers, the other with Natalie.