Otto Olsson was one of the biggest body organ virtuosos of his period. After studying body organ in the Stockholm Conservatory, he became a member of the staff like a teacher of tranquility and body organ. His strong history in counterpoint coupled with an affinity for French body organ music to generate his late Passionate style of structure. He also got a pastime in previous music and utilized the plainchant methods of Gregorian Chant in his =Gregorianska melodier=. He explored polytonality in his function, an advancement not really found in additional Swedish works of that time period. In addition to numerous fine functions for the body organ, instrumental and choral functions, his most widely known function is definitely =Te Deum=, a big piece for chorus, string orchestra, harp and body organ.