"Wär Gott nicht mit uns dieser Zeit" is a Lutheran hymn. Martin Luther based the words for this hymn on psalm 124 and evoces in this hymn vividly that men's life depends on God's help and is lost without it. Buxtehude creates a beautiful, slow moving pieces on the melody of this choral. Each phrase is introduced with short fore shadowings in the accompanying voices. A nice detail is that the last phrase is echod in the bass voice, after the solo voice has started it.
The recording was done with the Hauptwerk software and the sampleset, made by Voxus, of the Matthijs van Deventer-orgel in the Grote Kerk, Nijkerk (https://www.voxusorgans.com/en/product/nijkerk).
Score available here: http://partitura.org/index.php/dietrich-buxtehude-war-gott-nicht-mit-uns-dieser-zeit-buxwv-222