Trans-Siberian Orchestra (TSO) is an American progressive metal band founded in 1993 by producer, composer, and lyricist Paul O'Neill, who brought together Jon Oliva and Al Pitrelli (both members of Savatage) and keyboardist and co-producer Robert Kinkel to form the core of the creative team. Since then, TSO sold more than 9 million concert tickets and over 8 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 (the final installment of their Christmas trilogy), and their two-disc Night Castle. Trans-Siberian Orchestra is also known for their extensive charity work and elaborate concerts, which include an orchestra, a light show, lasers, pyrotechnics, moving trusses, video screens, and effects synchronized to music.
Both Billboard Magazine and Pollstar have ranked them as one of the top ten ticket-selling bands in the first decade of the new millennium. "Those who are left wondering how this act managed to rake in more than $200 million dollars between 2000 and 2009 have obviously never seen TSO live. If you fall within that unfortunate group TSO is a tough act to categorize. They feature plenty of rock but there is also classical, progressive, storytelling, spectacular lighting and enough lasers to make Dr. Evil jealous."