Sigfrid Karg-Elert
Sigfrid Karg-Elert (born Oberndorf am Neckar, 21 November 1877; died Leipzig, 9 April 1933) was a German composer.  He wrote in a late Romantic style.  He is mainly remembered for his music for organ and harmonium, his favourite instrument.  He wrote a set of 66 Chorale improvisations for organ, the best known of which is called Nun danket alle Gott (Now thank we all our God).