. >> along with the legendary conductor, john philip sousa. what was his role? >> to be the leader. including his own composition from time to time. sars and strikes forever being -- stars and stripes forever being the most well-known as well as a variety of popular music. >> as you were describing to harrison's walking out, i can envision our current president walking out with grandchildren. history and tradition really continues. >> absolutely and that is the beauty of the easter egg roll. it's one of the oldest and most deeply loved traditions. not just at the white house, but in all of washington. the more things change, the more they stay the same. >> presidents who have had children, you tell a number of stories along the way of children being involved. what are some of your favorite presidential children or grandchildren stories? >> i very much love this story of president carter and his -- both his children and his grandchildren being there when they brought in animals for the easter egg roll. it wasn't -- there were bunnies, but it was also they brought in, among other thin