Russian folk music became the primary source for the younger generation composers. A group that called itself "The Mighty Five", headed by Balakirev (1837–1910) and including Rimsky-Korsakov (1844–1908), Mussorgsky (1839–81), Borodin (1833–87) and César Cui (1835–1918), proclaimed its purpose to compose and popularize Russian national traditions in classical music. Among the Mighty Five's most notable compositions were the operas "The Snow Maiden" ("Snegurochka"), "Sadko", "Boris Godunov", "Prince Igor", "Khovanshchina", and symphonic suite "Scheherazade". Many of the works by Glinka and the Mighty Five were based on Russian history, folk tales and literature, and are regarded as masterpieces of romantic nationalism in music.