The Trans-Siberian Orchestra (often abbreviated to TSO) is an American progressive rock band founded in 1993 by Paul O'Neill.
Since then, TSO has gone on to sell nearly 8 million concert tickets and 8.5 million albums. The band's musical style incorporates classical, orchestral, symphonic, and progressive elements into hard rock and heavy metal.
The band is most famous for their series of Christmas-themed rock operas (Christmas Eve and Other Stories, The Christmas Attic, and The Lost Christmas Eve), for which they do an annual fall/winter tour.
Trans-Siberian Orchestra is known for their elaborate concerts, which are complete with a full orchestra, a massive light show, lasers, dozens of pyrotechnics, moving trusses, video screens, and other effects that are synchronized to the music.