The original score was composed by Hans Erdmann to be performed by an orchestra during the projection. However, most of the score has been lost, and what remains is only a reconstitution of the score as it was played in 1922. This is why so many composers and musicians have written or improvised their own soundtrack to accompany the film.
The video copyright is a Public Domain version of the film http://www.movie-censorship.com/report.php?ID=4112494 The Music belongs to Vik44