Johann Tobias Krebs (7 July 1690 ? 11 February 1762)
was a German organist and composer.
Krebs was born near Weimar, and died in the same
area. He is known as a student of Johann Gottfried
Walther and Johann Sebastian Bach.
He is believed to be the composer of the Eight Short
Preludes and Fugues previously attributed to J.S.
Bach. Source : Wikipedia