Popular games include soccer, kicking a ''sey,'' which is similar to a footbag, and chess. Based on the classical Indian solar calendar and Theravada Buddhism, the Cambodian New Year is a major holiday that takes place in April. Recent artistic figures include singers Sinn Sisamouth and Ros Serey Sothea (and later Preap Sovath and Sokun Nisa), who introduced new musical styles to the country.