Arvo Pärt is an Estonian classical composer and one of the most prominent living composers of sacred music. Since the late 1970s, Pärt has worked in a minimalist style that employs his self-invented compositional technique, tintinnabuli. His music also takes inspiration from Gregorian chant. (Wikipedia) The greatest living composer.
Edvard Hagerup Grieg (1843–1907), was a Norwegian composer and pianist. He is widely considered one of the leading Romantic era composers, and his music is part of the standard classical repertoire worldwide. His use and development of Norwegian folk music in his own compositions put the music of Norway in the international spectrum, as well as helping develop a national identity, much like Jean Sibelius and Antonín Dvořák did in Finland and Bohemia.