"Nun komm der Heiden Heiland" BuxWV 211

Organ music for Advent, performed on my Hauptwerk virtual pipe organ

From Wikipedia, "Nun komm, der Heiden Heiland" (original: "Nu kom der Heyden heyland", English: "Savior of the nations, come", literally: Now come, Saviour of the heathen) is a Lutheran chorale of 1524 with words written by Martin Luther, based on "Veni redemptor gentium" by Ambrose, and a melody, Zahn 1174, based on its plainchant. It was printed in the Erfurt Enchiridion of 1524.

The song was the prominent hymn for the first Sunday of Advent for centuries. It was used widely in organ settings by Protestant Baroque composers, most notably Johann Sebastian Bach, who also composed two church cantatas beginning with the hymn. Later settings include works by Max Reger, Brian Easdale and Siegfried Strohbach.

English versions include "Savior of the nations, come" by William Morton Reynolds, published in 1851.

Also from Wikipedia, Dieterich Buxtehude (born Diderik Hansen Buxtehude; c. 1637 – 9 May 1707) was a Danish or German organist and composer of the Baroque period, whose works are typical of the North German organ school. As a composer who worked in various vocal and instrumental idioms, Buxtehude's style greatly influenced other composers, such as Johann Sebastian Bach. Historically, Buxtehude is among the important composers of the mid-Baroque period in Germany.