Swedish composer, born June 15, 1926 in Orsa, died March 14, 2004 in Engelbrekt parish in Stockholm.

He graduated from Uppsala in 1946 and studied composition for Lars-Erik Larsson at the Stockholm Academy of Music 1948–1952 and the Royal College of Music in London 1952–1953 and in Rome 1953–1954. He also studied in Spain and Czechoslovakia. Carlstedt was one of the prominent Swedish modernists. His music creation is characterized by, among other things, folk music influences and fiddle traditions, as well as impressions from Russia and composers such as Benjamin Britten. He wrote a lot of choir music, chamber music, a couple of symphonies and the ballet Singoalla.

He was the initiator of the chamber music association Samtida Musik, which was formed in 1960, and he was its chairman 1960–1988. [8] He was also otherwise active in several of the Swedish music world's organizations, such as a board member of the Swedish Composers' Association 1961–1963 and STIM from 1970 and of the Musical Arts Association. In 1974 he was elected a member of the Royal Academy of Music. From 1963 to 1965 he also worked in the National Concerts' experimental activities (Music for Youth).