Klaus Mertens (Bass-Baritone)
Born: 25th March 1949, Kleve
Nationality: German
Artist's website: https://www.klausmertens.eu/index.php
Klaus Mertens is a German bass and bass-baritone singer who is known especially for his interpretation of the complete works of Johann Sebastian Bach for bass voice.
Read more at https://en.wikipedia.org/wiki/Klaus_Mertens