Harald Trygve Henschien (May 6, 1902 – June 21, 1968) was an accordionist, composer, accordion manufacturer, editor,[1][2][3] and the founder of the music magazine Rytme (Rhythm).

[1][4] He started his career as a performing musician at age 13[1] and became a prominent figure in Norwegian accordion and popular music.

He was the son of Theodor Catrinus Henschien (1855–1919) and Helga Hallstensdatter Gullingsrud (1872–1954) from the village of Bromma in the municipality of Nes.

Later, Henschien also made a name for himself in music education, including with a correspondence school that became popular throughout Scandinavia.

[7] The magazine Rytme (Rhythm) was founded in 1941, during the Second World War, with a hiatus in 1943 and 1944 because of a lack of paper.