Rascal Flatts will perform Wednesday (April 28) on American Idol before a May 1 engagement to sing the national anthem at the Kentucky Derby at Churchill Downs in Louisville, Ky. On American Idol, the band will perform "Unstoppable" and join Shakira in singing her song, "Gypsy." The trio previously performed on American Idol with Carrie Underwood in 2005 on the night she won the fourth season of the competition. Rascal Flatts also appeared on the show's "Idol Gives Back" episode in 2007. They will perform the national anthem prior to the running of the 136th Kentucky Derby. The event will be broadcast by NBC Sports. On April 30 at Churchill Downs, Little Big Town will perform the national anthem prior to the running of the Kentucky Oaks, the Derby's sister race for 3-year-old fillies. Rascal Flatts will also appear Friday (April 23) on Jamie Oliver's Food Revolution on ABC. They taped the episode earlier this year in Huntington, W.Va.