Outdoor performances can be staged simultaneously on the square. The pipe organ by Flentrop Orgelbouw in the National Concert Hall was the largest organ in Asia at the time of its installation in 1987. Both structures house art galleries, libraries, shops, and restaurants. The National Theater houses a Performing Arts Library and publication offices for Taiwan's "Performing Arts Review". National Theater and Concert Hall, like all performing arts venues in capital cities, play diplomatic as well as artistic roles. Guests regularly include top elected leaders in Taiwan as well as international artists and dignitaries. Visitors over the years have included Margaret Thatcher of the UK, Mikhail Gorbachev of the USSR, Lee Kuan Yew of Singapore, Rafael Calderón Muñoz of Costa Rica and former First Lady Betty Ford of the U.S. The National Theater and Concert Hall host a constant stream of events by local and international artists each year. Performers who have appeared in the National Theater include the Cloud Gate Dance Theater, The Kirov Ballet, the Suzuki Company of Toga and its director Tadashi Suzuki, Yang Li-hua Taiwanese Opera, the Ming Hwa Yuan Theater Troupe, the Fei Ma Yu Opera Troupe and Pili Heroes, kabuki performer Bandō Tamasaburō V, stage director Robert Wilson, and dancers Martha Graham, Merce Cunningham, Rudolph Nureyev, Pina Bausch, Trisha Brown, Liu Feng-hsueh, Lin Hwai-min, Lo Man-fei, Yu Hao-yen and Liu Shao-lu. International performers in the National Concert Hall have included composers Philip Glass and Samuel Adler and Fredrick Ernest, sopranos Jessye Norman, Barbara Hendricks and Mirella Freni, tenors Plácido Domingo, José Carreras and Luciano Pavarotti, baritone Bryn Terfel, violinists Pinchas Zukerman, Hilary Hahn and Akiko Suwanai, cellists Mstislav Rostropovich and Yo-Yo Ma, pianists Nobuyuki Tsujii, Ruth Slenczynska, Tatiana Nikolayeva, Fou Ts'ong and Vladimir Ashkenazy, conductors Simon Rattle, Günther Herbig, Mei-Ann Chen, Sergiu Celibidache, Michael Tilson Thomas, Apo Hsu, Helmuth Rilling and Lorin Maazel.