Question: Der Schwanendreher was a concerto by the composer of what nationality?
Context: The Tirol Concerto for Piano and Orchestra (also known as the Piano Concerto No. 1) is a piano concerto by Philip Glass.  The composer wrote the work in 2000.  On commission by the Festival Klangspuren in Stuttgart, it was written for the Stuttgart Chamber Orchestra.  It is one of eight concerti in Glass' series "The Concerto Project", an amalgamation of works in four volumes. Béla Bartók's Violin Concerto No. 2, BB 117 was written in 1937–38.  During the composer's life, it was known simply as his Violin Concerto.  (His other violin concerto, Violin Concerto No. 1, Sz.  36, BB 48a was written in the years 1907–1908, but only published in 1956, after the composer's death, as "Violin Concerto No. 1, Op.  posth.") Paul Hindemith's Der Schwanendreher (literally, "The Swan turner") is a concerto for viola and orchestra.  "Der Schwanendreher" occupies a place at the core of the viola concerto repertoire, along with the concertos by Walton and Bartók.  It was composed in 1935 and premiered by the composer himself at a performance in Amsterdam on 14 November 1935.  Each movement is based on a separate medieval German folk song, thus, it is sometimes referred to as the "Concerto from Old Folk Songs".  This composition draws its title from the final movement's folk song base, "Aren't you the swan turner?" . The Oboe Concerto in D minor, S D935, is an early 18th-century concerto for oboe, strings and continuo attributed to the Venetian composer Alessandro Marcello.  The earliest extant manuscript containing Johann Sebastian Bach's solo keyboard arrangement of the concerto, BWV 974, dates from around 1715.  As a concerto for oboe, strings and continuo its oldest extant sources date from 1717: that year it was printed in Amsterdam, and a C minor variant of the concerto, S Z799, was written down. Paul Hindemith ( ) (16 November 1895 – 28 December 1963) was a prolific German composer, violist, violinist, teacher and conductor.  Notable compositions include his song cycle "Das Marienleben" (1923), "Der Schwanendreher" for viola and orchestra (1935), and opera "Mathis der Maler" (1938).  Hindemith's most popular work, both on record and in the concert hall, is likely the "Symphonic Metamorphosis of Themes by Carl Maria von Weber", written in 1943. The Cello Concerto No. 1 (also the Concerto for Cello and Orchestra) was written by Philip Glass in 2001.  It was one of the first concerti of the twenty-first century.  The piece was commissioned by William and Rebecca Krueger, friends of the composer, for the 50th birthday of cellist Julian Lloyd Webber.  A typical performance takes about 30 minutes.  The work is paired with the "Concerto Fantasy for Two Timpanists and Orchestra" as part of Glass' "Concerto Project", a series of collected concerti by the composer.  The cello concerto is among the most famous of Glass' works for a solo instrument. The Concerto Fantasy for Two Timpanists and Orchestra is a double timpani concerto written by Philip Glass in 2000.  It is paired with the Cello Concerto on "Vol.  I" of Glass' "Concerto Project", a set of eight concerti by the composer.  A typical performance of the work lasts 25–28 minutes.  It was written for Jonathan Haas and later recorded by Evelyn Glennie, and was premiered by Haas with the American Symphony Orchestra in Avery Fisher Hall, Lincoln Center, conducted by Leon Botstein.  The work was commissioned jointly by the American Symphony Orchestra, the Peabody Symphony, the Milwaukee Symphony, the St. Louis Symphony and the Phoenix Symphony.  In 2004, a transcription for wind ensemble was written by Mark Lortz, which debuted at Peabody Institute in 2005. The Yellow River Piano Concerto () is a piano concerto arranged by a collaboration between musicians including Yin Chengzong and Chu Wanghua, and based on the "Yellow River Cantata" by composer Xian Xinghai.  Since its politicised premiere in 1969 during the Cultural Revolution, the Concerto has become popular in China and amongst overseas Chinese nationalists.  It is noted for a difficult solo part.  This piano concerto and the Butterfly Lovers' Violin Concerto, which tells the story of the Butterfly Lovers, are two internationally known Chinese works that combine Western music methodology with Chinese source materials. The Concerto for Piano and Orchestra in G minor, Op. 33, is the only piano concerto by Czech composer Antonín Dvořák.  Written in 1876, it was the first of three concertos that Dvořák completed, followed by the Violin Concerto, Op. 53 from 1879 and the Cello Concerto, Op. 104, written in 1894–1895.  The piano concerto is probably the least known and least performed of Dvořák's concertos. The Viola Concerto by William Walton was written in 1929 for the violist Lionel Tertis at the suggestion of Sir Thomas Beecham.  The concerto carries the dedication "To Christabel" (Christabel McLaren, Lady Aberconway).  But Tertis rejected the manuscript, and composer and violist Paul Hindemith gave the first performance.  The work was greeted with enthusiasm.  It brought Walton to the forefront of British classical music.  In "The Manchester Guardian", Eric Blom wrote, "This young composer is a born genius" and said that it was tempting to call the concerto the best thing in recent music of any nationality.  Tertis soon changed his mind and took the work up.
Answer: German