Oskar Lindberg (23 February 1887 – 10 April 1955) was a nationalist/romantic composer who in 1939 edited the Church of Sweden's hymnbook. His 1912 Requiem was of particular importance to the history of Swedish liturgical works.
He wrote in a romantic idiom which blended features of composers such as Rachmaninoff and Sibelius with folk music and impressionistic elements.
Lindberg was also prominent as a teacher, holding posts in the conservatory in Stockholm as well as in local high schools. He was a member of the Swedish Royal Academy of music from 1926 until his death.
In 1936, Lindberg heard a song at a worship service in Gagnef (Dalarna). Based on the melody of the song, he wrote an organ work which he called "Gammal fäbodpsalm från Dalarna". Certainly it is best-known and most-loved work.
I believe this means: "Old Psalm Tune" or "Old Pastoral Hymn" from Dalarna.
The score calls for a "Krummhorn" for the solo, and this performance features the . Dolceaan of the Bovenwerk. For added "expression" you'll hear the Quintadena added first, and then the Baarpyp. They are then subtracted one by one to create a diminuendo.
The score is attached below, as well as a photo of Oskar Lindberg.