"Fröhlich soll mein Herzen springen" is a choral that is sung on the first day of Christmas. Sorge wrote a festive prelude for this choral melody. The left hand and feet play a fast paced accompaniment to the choral melody in the right hand. Writte in the key of E major it must have caused some uneasy moments on organs in older tunings.
The recording was done with the Hauptwerk software and the sample set of the Silbermann organ of the Stadtkirche Zöblitz by Prospectum (http://www.prospectum.com/index.php?language=english&id1=2&id2=8).
Score available here: http://partitura.org/index.php/frohlich-soll-mein-herzen-springen/