in 2006 with the WDR Symphony Orchestra, Cantus by Aribert Reimann; and in 2015 "über" by Mark Andre at the Donaueschingen Festival. Widmann's core repertoire as clarinetist includes Pierre Boulez's Dialogue de l'ombre double, which he performed on Boulez's 85th birthday in Paris. Career as composer Widmann's compositions draw on different musical genres. For example, he has written a trilogy for orchestra examining the projection of vocal forms of instrumental ensembles. The trilogy consists of Lied (premiered in 2003 and recorded on CD by the Bamberg Symphony with Jonathan Nott), Chor (premiered in 2004 by the Deutsches Symphonie-Orchester Berlin with Kent Nagano) and Messe (premiered in June 2005 by the Munich Philharmonic under Christian Thielemann). In 2007, Pierre Boulez and the Vienna Philharmonic premiered his orchestral work Armonica. His early string quartets are of particular note among his chamber music: the First Quartet was written in 1997, followed by the Chorale Quartet and the Hunting Quartet, the latter premiered in 2003 by the Arditti Quartet. 2005 saw the first performances of the Fourth Quartet and Experiment on a Fugue (Fifth Quartet, with soprano), with Juliane Banse and the Artemis Quartet. These five one-movement quartets form a cycle. Widmann was Composer in Residence at the Salzburg Festival and at the chamber music festival Spannungen, Heimbach in 2004. Octet was premiered on 4 June 2004 at the power plant Kraftwerk Heimbach. Widmann premiered Am Anfang by Anselm Kiefer in July 2009 as part of the 20th anniversary of the Opéra Bastille, in which he acted as composer, clarinetist and made his debut as conductor. He was Composer in Residence at the Lucerne Festival in 2009, where on 13 August 2009, Heinz Holliger performed Widmann's oboe concerto, commissioned by the festival. On 5 September Widmann premiered Holliger's Rechant for solo clarinet. Widmann's Free Pieces for Ensemble: Number X is used in Sophie Fiennes's documentary Over Your Cities Grass Will Grow (2010), about the postwar German artist Anselm Kiefer. His sister Carolin Widmann premiered his études IV-VI for violin (20042010) at the Wittener Tage für neue Kammermusik on 23 April 2010. From 2009 to 2011 he was the Daniel R. Lewis Young Composer Fellow at the Cleveland Orchestra. He performed his Fantasie for Solo Clarinet (1993) to celebrate Walter Fink's 80th birthday at the Rheingau Musik Festival on 16 August 2010 and in 2014 was the festival's Composer and Artist in Residence. Widmann was