Tilson Thomas collaborated with YouTube in 2009 to help create the YouTube Symphony Orchestra, an orchestra whose members were selected from 30 countries based on more than 3,000 video auditions on YouTube. The Orchestra, as well as such soloists as Mason Bates, Measha Brueggergosman, Joshua Roman, Gil Shaham, Yuja Wang, Jess Larsen, Charlie Liu, and Derek Wang, participated in a classical music summit in New York City at the Juilliard School over three days. The event culminated in a live concert at Carnegie Hall on Wednesday, April 15. The concert was later made available on YouTube. On March 20, 2011, Tilson Thomas also conducted the "YTSO2" (YouTube Symphony Orchestra 2) in Sydney.