experimental sound, noise, dance, theatre, visual art, performance and new media. In August 2011, Glass presented a series of music, dance, and theater performances as part of the Days and Nights Festival. Along with the Philip Glass Ensemble, scheduled performers include Molissa Fenley and Dancers, John Moran with Saori Tsukada, as well as a screening of Dracula with Glass's score. Glass hopes to present this festival annually, with a focus on art, science, and conservation.Other works completed since 2010 include Symphony No. 9 (2010–2011), Symphony No. 10 (2012), Cello Concerto No. 2 (2012, based on the film score to Naqoyqatsi) as well as String Quartet No. 6 and No. 7. Glass's Ninth Symphony was co-commissioned by the Bruckner Orchestra Linz, the American Composers Orchestra and the Los Angeles Philharmonic Orchestra. The symphony's first performance took place on January 1, 2012, at the Brucknerhaus in Linz, Austria (Dennis Russell Davies conducting the Bruckner Orchestra Linz); the American premiere was on January 31, 2012, (Glass's 75th birthday), at Carnegie Hall (Dennis Russell Davies conducting the American Composers Orchestra), and the West Coast premiere with the Los Angeles Philharmonic under the baton of John Adams on April 5. Glass's Tenth Symphony, written in five movements, was commissioned by the Orchestre français des jeunes for its 30th anniversary. The symphony's first performance took place on August 9, 2012, at the Grand Théâtre de Provence in Aix-en-Provence under Dennis Russell Davies. The opera The Perfect American was composed in 2011 to a commission from Teatro Real Madrid. The libretto is based on a book of the same name by Peter Stephan Jungk and covers the final months of the life of Walt Disney. The world premiere was at the Teatro Real, Madrid, on January 22, 2013, with British baritone Christopher Purves taking the role of Disney. The UK premiere took place on June 1, 2013, in a production by the English National Opera at the London Coliseum. The US premiere took place on March 12, 2017, in a production by Long Beach Opera. His opera , based on a play by Austrian playwright and novelist Peter Handke, Die Spuren der Verirrten (2007), premiered at the in April 2013, conducted by Dennis Russell Davies and directed by David Pountney. On June 28, 2013, Glass's piano piece Two Movements for Four Pianos was premiered at the Museum Kunstpalast, performed by Katia and Marielle Labèque, and Dennis Russell