Alberto Evaristo Ginastera was an Argentine composer of classical music. He is considered to be one of the most important 20th-century classical composers of the Americas.
George Theophilus Walker was an American composer, pianist, and organist, and the first African American to win the Pulitzer Prize for Music, which he received for his work Lilacs in 1996. Walker was married to pianist and scholar Helen Walker-Hill between 1960 and 1975. Walker was the father of two sons, violinist and composer Gregory T.S. Walker and playwright Ian Walker.
Grażyna Bacewicz Biernacka was a Polish composer and violinist. She is the second Polish female composer to have achieved national and international recognition, the first being Maria Szymanowska in the early 19th century.
Richard Anthony Sayer Arnell was an English composer of classical music. Arnell composed in all the established genres for the concert stage, and his list of works includes six completed symphonies and six string quartets. At the Trinity College of Music, he "promoted a pioneering interest in film scores and electronic music" and jazz.
Arnold Atkinson Cooke was a British composer, a pupil of Paul Hindemith. He wrote a considerable amount of chamber music, including five string quartets and many instrumental sonatas, much of which is only now becoming accessible through modern recordings. Cooke also composed two operas, six symphonies and several concertos.
Walter Sinclair Hartley was an American composer of contemporary classical music.
Gail Thompson Kubik was an American composer, music director, violinist, and teacher.
Mozart Camargo Guarnieri was a Brazilian composer.
Hendrik Franciscus Andriessen was a Dutch composer and organist. He is remembered most of all for his improvisation at the organ and for the renewal of Catholic liturgical music in the Netherlands. Andriessen composed in a musical idiom that revealed strong French influences. He was the brother of pianist and composer Willem Andriessen and the father of the composers Jurriaan Andriessen and Louis Andriessen and of the flautist Heleen Andriessen.
David Wynne was a prolific Welsh composer, who taught for many years at Cardiff University and wrote much of his best-known music in retirement.
Ross Lee Finney Junior was an American composer who taught for many years at the University of Michigan.
Jaroslav Řídký was a Czech composer, conductor, harpist, and music teacher.
William Brocklesby Wordsworth was an English composer. His works, which number over 100, were tonal and romantic in style in the widest sense and include eight symphonies and six string quartets.
Niels Erling Emmanuel Brene was a Danish composer. He was born and died in Copenhagen. In 1948, he won a bronze medal in the art competitions of the Olympic Games for his orchestral composition Vigeur (Vigour).
Gary Kulesha is a Canadian composer, pianist, conductor, and educator. Since 1995, he has been Composer Advisor to the Toronto Symphony Orchestra. He has been Composer-in-Residence with the Kitchener-Waterloo Symphony (1988–1992) and the Canadian Opera Company (1993–1995). He was awarded the National Arts Centre Orchestra Composer Award in 2002. He currently teaches on the music faculty at the University of Toronto.
Mark Wessel was an American pianist and composer.
Ruth Shaw Wylie was a U.S.-born composer and music educator. She described herself as “a fairly typical Midwestern composer,” pursuing musical and aesthetic excellence but not attracting much national attention: “All good and worthy creative acts do not take place in New York City,” she wrote in 1962, “although most good and worthy rewards for creative acts do emanate from there; and if we can’t all be on hand to reap these enticing rewards we can take solace in the fact that we are performing good deeds elsewhere.” She was among the many twentieth-century American composers whose work contributed to the recognition of American “serious” music as a distinct genre.
You may hear Homer Keller's Serenade for Clarinet and Strings performed by Howard Hanson conducting the Eastman-Rochester Symphony Orchestra and Rufus Arey, clarinet in 1941 Here on archive.org 
