Théodore Dubois (1837-1924) was a French romantic composer, organist, and music teacher.
He became an organist and choirmaster at several well-known churches in Paris and, at the same time, was a professor in the Conservatoire. He was forced to retire early from his position at the Conservatoire after a scandal erupted over the faculty's attempt to rig the Prix de Rome competition to prevent the modernist, Maurice Ravel, from winning. Dubois' books on music theory were influential, and remained in use for many years.
The Fantasie Triomphale for organ and orchestra was composed for the inauguration of the Chicago Auditorium and was dedicated to Clarence Eddy (then Dean of the American Guild of Organists).