Gasser performed Stevenson 's '' Passacaglia on DSCH '' at Carnegie Hall as a charity concert shortly after the attacks on the World Trade Center in New York City , to raise money for the families of rescue workers who died in the September 11 attacks , and most recently at the Utzon Room , Sydney Opera House ( 2012 ) to launch Yamaha 's CFX Concert Grand Piano in Australia
September 11 attacks
September 11 attacks
Mark Gasser