Per Nørgård

Per Nørgård was a Danish composer and music theorist. Though his style varied considerably throughout his career, his music often included repeatedly evolving melodies, in the vein of Jean Sibelius, and a perspicuous focus on lyricism. He based music on "infinity series" and other mathematical models. He composed large-scale works, eight symphonies including the choral Third, concertos and operas such as Gilgamesh. His chamber music includes ten string quartets and music for guitar.

Read more at https://en.wikipedia.org/wiki/Per_Nørgård