an Entity references as follows:
Clemens Ganz (born 18 January 1935 in Nohfelden) is a German organist. Ganz studied with Hermann Schroeder and Josef Zimmermann church music and school music at the Hochschule für Musik in Cologne (A-examination). From 1964–1976 he was cantor at St. Marien in Köln-Kalk. From 1971–1998 he taught as professor at the Hochschule für Musik. From 1985–2001 he was organist of Cologne Cathedral.