Mary Louise Barratt Due (9 April 1888 – 24 December 1969)[1] was known as one of the most influential Norwegian pianists in the 20th century.

[2][3] Barratt Due was born in Bergen, Norway, but the family moved the following year to Kristiania (Oslo), where her father was a minister in the Methodist Church.

Both parents played and sang, and her father's daily morning devotions attended all the family in the song.

Here she spent six years in an international and exuberant musical environment, where also theory and language were part of the curriculum, and in 1906 she made her debut in Oslo, and in 1907 she took a diploma exam in Italy.

Apart from Liszt and Chopin, she was also open to the new style of Impressionism in music, and was among the first in Norway to put Claude Debussy on the schedule.