Scope and Contents Sanctus no. III : in d minor, BWV 239 / J.S. Bach ; Richard Proulx. This work was edited by Proulx through the addition of a continuo part. Proulx also takes authorship for the alternate text provided in this edition. The following paragraph is on the last page of this piece: This is one of the more obscure (and unperformed) smaller pieces of liturgical music by the great Sebastian Bach. There exist five independent settings of the Sanctus which were used with his various Missa...