Carl Henrik Ludolf Nielsen (1865–1931) was a prominent Danish composer and conductor, widely regarded as one of the most significant figures in Danish music history. Nielsen's work is primarily associated with the classical genre, and he is often celebrated for his symphonies, chamber music, and operas. His notable works include six symphonies, with the Fourth Symphony, known as the "Inextinguishable," being particularly acclaimed for its innovative orchestration and thematic development. Other significant compositions include the opera "Maskerade," the concertos for flute and violin, and various string quartets. Nielsen's music is characterized by its lyrical melodies, complex harmonies, and a blend of nationalistic elements with modernist influences. He was instrumental in elevating Danish music on the international stage, helping to establish a distinct national identity in the early 20th century. His influence extends beyond his own compositions, inspiring subsequent generations of composers in Denmark and abroad. Nielsen's music remains a vital part of the classical repertoire and continues to be performed and studied, reflecting his enduring legacy in the world of classical music.