Carrie Underwood was brought to tears during one particularly moving American Idol audition. During the Monday, February 2, episode of the reality singing competition, Underwood and her fellow judges, Lionel Richie and Luke Bryan, listened to season 24 hopeful Hannah Harper perform her original song "String Cheese." After explaining that the song was written as a reflection of her experience with postpartum depression, Harper drew an emotional response from Underwood, 42.