

In 1927 he was appointed Professor at the Berliner Hochschule für Musik in Berlin. The following year, he began to work as an organizer of the Donaueschingen Festival, where he programmed works by several avant garde composers, including Anton Webern and Arnold Schoenberg. In 1922, some of his pieces were played in the International Society for Contemporary Music festival at Salzburg, which first brought him to the attention of an international audience.

In 1921 he founded the Amar Quartet, playing viola, and extensively toured Europe. After the armistice he returned to Frankfurt and the Rebner Quartet. In May 1918 he was deployed to the front in Flanders, where he served as a sentry his diary shows him "surviving grenade attacks only by good luck", according to New Grove Dictionary. There he was assigned to play bass drum in the regiment band, and also formed a string quartet. Hindemith was conscripted into the German army in September 1917 and sent to join his regiment in Alsace in January 1918. He played second violin in the Rebner String Quartet from 1914. He became deputy leader of the Frankfurt Opera Orchestra in 1914, and was promoted to leader in 1917. At first he supported himself by playing in dance bands and musical-comedy groups. He entered Frankfurt's Hoch’sche Konservatorium, where he studied violin with Adolf Rebner, as well as conducting and composition with Arnold Mendelssohn and Bernhard Sekles. Born in Hanau, near Frankfurt am Main, Hindemith was taught the violin as a child.
