Carl August Nielsen (9 June 1865 – 3 October 1931) was a Danish musician, conductor and violinist, widely recognized as his country’s most prominent composer. He initially played in a military band before attending the Royal Danish Academy of Music in Copenhagen from 1884 until December 1886. He premiered his Op. 1, Suite for Strings, in 1888, at the age of 23. The following year, Nielsen began a 16-year stint as a second violinist in the Royal Danish Orchestra under the conductor Johan Svendsen. In 1916, he took a post teaching at the Royal Academy and continued to work there until his death.

Nielsen is especially noted for his six symphonies, his Wind Quintet and his concertos for violin, flute and clarinet. In Denmark, his opera Maskarade and many of his songs have become an integral part of the national heritage. His early music was inspired by composers such as Brahms and Grieg, but he soon developed his own style, first experimenting with progressive tonality and later diverging even more radically from the standards of composition still common at the time. Nielsen’s sixth and final symphony, Sinfonia semplice, was written in 1924–25.