Opera The HD video opera transmissions are presented via the same HD digital cinema projectors used for major Hollywood films. European opera houses and festivals including the Royal Opera in London, La Scala in Milan, the Salzburg Festival, La Fenice in Venice, and the Maggio Musicale in Florence have also transmitted their productions to theaters in cities around the world since 2006, including 90 cities in the U.S. The emergence of the Internet has also affected the way in which audiences consume opera. In 2009 the British Glyndebourne Festival Opera offered for the first time an online digital video download of
Metropolitan Opera House (Lincoln Center) premieres of operas, including John Corigliano's "The Ghosts of Versailles", Phillip Glass's "The Voyage" and the US premiere of Nico Muhly's "Two Boys" in 2013. When the Metropolitan Opera is on hiatus, the Opera House is home to the annual Spring season of American Ballet Theatre (ABT). It regularly hosts touring opera and ballet companies including the Kirov, Bolshoi, and the La Scala companies. In addition, the Met has presented recitals by Vladimir Horowitz, Renée Fleming, Kathleen Battle and others. Philip Glass's "Einstein on the Beach" was staged independently at the Met in 1976. Concerts by Barbra Streisand, The Who,