Trans-Siberian Orchestra is an American progressive rock band founded in 1993 by producer, composer, and lyricist Paul O'Neill, who brought together Jon Oliva and Al Pitrelli and keyboardist and co-producer Robert Kinkel to form the core of the creative team. The band gained in popularity when they began touring in 1999 after completing their third rock opera, "Beethoven's Last Night." In 2007, the Washington Post referred to them as "an arena-rock juggernaut" and described their music as "Pink Floyd meets Yes and The Who at Radio City Music Hall." TSO has sold more than 10 million concert tickets and over 10 million albums. The band's musical style incorporates classical, orchestral, symphonic, and progressive elements into hard rock and heavy metal. The band has released a series of rock operas: Christmas Eve and Other Stories, The Christmas Attic, Beethoven's Last Night, The Lost Christmas Eve, and their two-disc Night Castle. Trans-Siberian Orchestra is also known for their extensive charity work and elaborate concerts, which include a string section, a light show, lasers,"enough pyro to be seen from the international space station", moving trusses, video screens, and effects synchronized to music.