So a tour rider is more or less a list of demands set for by an artist's management team to help the artist feel more comfortable while on the road performing. Some have been legendary. Artists asking for rare flowers, expensive bottle of liquor, even asking for M&M's of a certain color.
Justin Bieber's tour rider for the India leg of the Purpose tour leaked online, and it puts most others to shame. It includes ping-pong tables, jacuzzi's, and an Indian Yoga Casket (whatever the eff that is?)...