This piece is taken from Fifteen Pieces for Organ Founded on Antiphons by Marcel Dupre (Opus 18)
The slow & beautiful melody is done here on the 8' Harmonic Flute.
The accompaniement is done with the 8' Voix Celeste and the 16' Rohr Gedackt in place of the 16' Quintaton recommended by Dupre.
Pedal is 32' Contre Bourdon, 16' Rohr Gedackt & 8' Nachthorn.
This sample set is used without any additional reverb added to it.