Otto Olsson was one of the greatest organ virtuosos of his time. After studying organ at the Stockholm Conservatory, he joined the staff as a professor of harmony and organ. His strong background in counterpoint combined with an affinity for French organ music to create his late Romantic style of composition. He also had an interest in earlier music and used the plainchant techniques of Gregorian Chant in his =Gregorianska melodier=. He explored polytonality in his work, an advancement not found in other Swedish works of the time. In addition to many fine works for the organ, instrumental and choral works, his best known work is =Te Deum=, a large piece for chorus, string orchestra, harp and organ.