O Lamm Gottes, unschuldig

Hans Friedrich Micheelsen (1902-1973) was a German composer, organist and church musician. Micheelsen's composition instructors included Paul Kickstat and Paul Hindemith. Micheelsen wrote vocal and instrumental music, especially for organ. He primarily composed sacred music, though he did write some secular chamber music. Many of his works, including five of his seven Orgelkonzerte (organ concertos),are based on Lutheran chorales.

As a church musician, Micheelsen worked in Brunsbüttel, Berlin and Hamburg. In addition to his work as an organist, Micheelsen also taught church music. Beginning in 1938, he directed the Kirchenmusikschule der Hamburgischen Landeskirche. When that school merged with the Staatliche Hochschule für Musik, Micheelsen became head of its church music department. He taught there until his retirement in 1962.
(source: Wikipedia)

Hereby a beautiful silenced chorale prelude on the Passion hymn 'O Lamm Gottes, unschuldig' in which some traces of J.S. Bach can be found, I think.