Question: What is the nationality of the composer of Lento?

full_context: Document 1: Lento for Strings: Lento for Strings is an orchestral work by the Australian composer Malcolm Williamson.
Document 2: Asko Concerto: The Asko Concerto is a concerto for chamber orchestra by the American composer Elliott Carter. The work was commissioned by the Dutch chamber group Asko Ensemble, for which the piece is titled. It was composed in January 2000 and was first performed in Concertgebouw, Amsterdam on April 26, 2000, by the Asko ensemble under the conductor Oliver Knussen. The piece is dedicated to Asko/Schönberg.
Document 3: Spem in alium: Spem in alium (Latin for "Hope in any other") is a 40-part Renaissance motet by Thomas Tallis, composed in c. 1570 for eight choirs of five voices each, considered by some critics to be the greatest piece of English early music. Along with Tallis's "Lamentations", H. B. Collins described it in 1929 as Tallis's "crowning achievement".
Document 4: A Symphony of Three Orchestras: A Symphony of Three Orchestras is an orchestra composition by the American composer Elliott Carter. The work was commissioned by the New York Philharmonic through a grant from the National Endowment for the Arts. It was composed from June through December 1976 and was first performed in New York City on February 17, 1977 by the New York Philharmonic under the conductor Pierre Boulez. The composition is dedicated to Boulez and the New York Philharmonic.
Document 5: Symphonia: sum fluxae pretium spei: The Symphonia: sum fluxae pretium spei is an orchestral triptych by the American composer Elliott Carter. Its three movements were composed between 1993 and 1995. The complete work was first performed on April 25, 1998 at Bridgewater Hall, Manchester by the BBC Symphony Orchestra under the conductor Oliver Knussen. The second movement "Adagio tenebroso" was a finalist for the 1996 Pulitzer Prize for Music.
Document 6: Three Occasions for Orchestra: Three Occasions for Orchestra is an orchestral triptych by the American composer Elliott Carter. The work was composed from 1986 through 1989 and was first performed at the Royal Festival Hall, London, by the BBC Symphony Orchestra under Oliver Knussen on October 5, 1989.
Document 7: Nick Ariondo: Nicholas Ariondo is an American accordionist, pianist, and composer. He is known for his work with various singers, such as Paul McCartney and Placido Domingo. A double Grammy Award winner with the Los Angeles Opera Orchestra, he became the first American to be awarded Italy's Ancona Prize for his "Kalamatiano for Viola & Free-bass Accordion" (ACCO-Music Publishing). As accordionist-composer, he received over twenty awards from the American Society of Composers, Authors and Publishers (ASCAP) for his compositions and performances. He performs classical, jazz, and world music. Bill Palmer, historian, pianist, accordionist, composer, and editor for Alfred Music Publishing, nominated Ariondo for the International Who's Who in Music.
Document 8: Requiem (Henze): Hans Werner Henze composed the nine Sacred Concertos that comprise his Requiem over the course of three years from 1991 to 1993 on commissions from the London Sinfonietta, Suntory Corporation for the NHK Philharmonic, and Westdeutscher Rundfunk, Cologne. The first movement, "Introitus: Requiem Aeternam" was commissioned by the London Sinfonietta as part of a memorial concert for Artistic Director Michael Vyner who died on 20 October 1989. In addition to Henze, the London Sinfonietta also commissioned seven other prominent composers (Luciano Berio, Sir Harrison Birtwistle, Sir Peter Maxwell Davies, Toru Takemitsu, Oliver Knussen, and Nigel Osborne) to write works in Vyner's memory to make up the program which was performed on the 6 May 1990.
Document 9: Concerto in E-flat &quot;Dumbarton Oaks&quot;: Concerto in E-flat, subtitled Dumbarton Oaks 8-v-1938 (1937–38) is a chamber concerto by Igor Stravinsky, named for the Dumbarton Oaks estate of Robert Woods Bliss and Mildred Barnes Bliss in Washington, DC, who commissioned it for their thirtieth wedding anniversary. Composed in Stravinsky's neo-classical period, the piece is one of Stravinsky's two chamber concertos (the other being the Concerto in D, for strings, 1946) and is scored for a chamber orchestra of flute, B♭ clarinet, bassoon, two horns, three violins, three violas, two cellos, and two double basses. The three movements, Tempo giusto, Allegretto, and Con moto, performed without a break, total roughly twelve minutes. The concerto was heavily inspired by Bach's set of Brandenburg Concertos, and was the last work Stravinsky completed in Europe, started in spring 1937 at the Château de Montoux near Annemasse, near Geneva, Switzerland, and finished in Paris on March 29, 1938 .
Document 10: Albert Ketèlbey: Albert William Ketèlbey ( ; born Ketelbey; 9 August 1875 – 26 November 1959) was an English composer, conductor and pianist, best known for his short pieces of light orchestral music. He was born in Birmingham and moved to London in 1889 to study at Trinity College of Music. After a brilliant studentship he did not pursue the classical career predicted for him, becoming musical director of the Vaudeville Theatre before gaining fame as a composer of light music and as a conductor of his own works.
Document 11: Howard Levy: Howard Levy (born July 31, 1951) is an American harmonica player, multi-instrumentalist, and owner of Balkan Samba Records. He was a founding member of Béla Fleck and the Flecktones, with whom he won a 1997 Grammy Award for Best Pop Instrumental Performance for the song "The Sinister Minister". He also won a Grammy for Best Instrumental Composition in 2012 for "Life in Eleven", a song written with Béla Fleck for the Flecktones' album "Rocket Science" (2011). He has worked with Arab-fusion musician Rabih Abou-Khalil, Latin jazz saxophonist Paquito D'Rivera, Donald Fagen, and Paul Simon.
Document 12: Howard Skempton: Howard While Skempton (born 31 October 1947) is an English composer, pianist, and accordionist.
Document 13: Lento (Skempton): Lento is a composition for orchestra written by Howard Skempton in 1990. It was Skempton's third work for large forces, and his first major success.
Document 14: Jon Appleton: Jon Howard Appleton (born January 4, 1939) is an American composer and teacher who was a pioneer in electro-acoustic music. His earliest compositions in the medium, e.g. Chef d'Oeuvre and Newark Airport Rock attracted attention because they established a new tradition some have called programmatic electronic music. In 1970 he won Guggenheim, Fulbright and American-Scandinavian Foundation fellowships. When he was twenty-eight years old he joined the faculty of Dartmouth College where he established one of the first electronic music studios in the United States. He remained there intermittently for forty-two years. In the mid-1970s he left Dartmouth to briefly become the head of Elektronmusikstudion (EMS) in Stockholm, Sweden. In the late 1970s, together with Sydney Alonso and Cameron Jones he helped develop the first commercial digital synthesizer called the Synclavier. For a decade he toured around the United States and Europe performing the compositions he composed for this instrument. In the early 1990s he helped found the Theremin Center for Electronic Music at the Moscow Conservatory of Music where he continues to teach once a year. He has also taught at Keio University (Mita) in Tokyo, Japan, CCRMA at Stanford University and the University of California Santa Cruz. In his later years he has devoted most of his time to the composition of instrumental and choral music in a quasi-Romantic vein which has largely been performed only in France, Russia and Japan.
Document 15: Howard Blake: Howard Blake OBE (born 28 October 1938) is an English composer, conductor, and pianist whose career has spanned more than 50 years and produced more than 650 works. Blake's most successful work is his soundtrack for Channel 4’s 1982 film "The Snowman" including the song "Walking in the Air". He is increasingly recognised for his classical works including concertos, oratorios, ballets, operas and many instrumental pieces.
ground_truth: English