WTC 9/11 is a composition by Steve Reich for string quartet written in 2009–2010 which premiered on March 19, 2011 at Duke University. The piece was written for the Kronos Quartet, who performed the premiere, and was co-commissioned by Barbican Centre, Carnegie Hall, Duke University, the University of Illinois at Urbana–Champaign, the Philharmonic Society of Orange County, the Phyllis C. Wattis Foundation, and the National Endowment for the Arts. The piece draws inspiration from the events of September 11, 2001. Other 9/11 recordings are considered.