This children's choir has a special talent you'll love, but then a very special guest joined in.

Famous superstar Carrie Underwood took time out of her busy schedule to meet up with the PS22 chorus from an elementary school in NY. When these kids started singing her song "so small," she was simply caught up in the moment. The art of this performing is beautiful, but in the minute 3.45 of this video left me in tears.