Musical compositions include the "Song of General Kim Il Sung", "Long Life and Good Health to the Leader," and "We Sing of His Benevolent Love"—hymns that praise the nation's leader. According to a North Korean writer, "Our musicians have pursued the party's policy of composing orchestral music based on famous songs and folk songs popular among our people and produced numerous instrumental pieces of a new type." This music includes a symphony based on the theme of The Sea of Blood, which has also been made into a revolutionary opera.