Sigfrid Karg-Elert (born Oberndorf am Neckar, 21 Nov 1877; died Leipzig, 9 April 1933)
Number 15 of Opus 65 Herzlich lieb hab dich, o Herr
The music is here;
66 organ pieces composed between 1906 and 1908. They were first published in 1909 and dedicated to Alexandre Guilmant. Op 65 includes the well known Nun danket alle Gott.
Karg-Elert was a German composer and teacher whose most notable influences included Carl Reinecke, Edvard Grieg, Claude Debussy, Arnold Schoenberg, and Alexander Scriabin.
His favourite instrument to compose for was the Kunstharmonium, a versatile French creation that allowed him the range of colors he preferred. From 1924 he gave weekly radio harmonium recitals from his house. To see Karg-Elert's creativity and the flexibility and range of colours offered by the Kunstharmonium have a look at Opus 101. Musical portaits of 33 composers from Palestrina to Schönberg.
I have used the Riddagshausen organ that I really like and I think it handles this music quite well. This sample seems to have slipped down the list a bit now that there are so many other organs to choose from.