Bach's Sanctus BWV 239 is described in the comment as "believed to be a copy of a Sanctus by another composer"... This is not "believe to be", it surely is the Gloria from Antonio Caldara's Missa Providentiae.
I think the page should show a clear disclaimer with the correct known attribution.
But there's another problem with the page of Caldara's Mass. Caldara's parts are only Kyrie and Gloria, the mass was completed by Jan Dismas Zelenka (Sanctus and Angnus Dei re-elaborating Caldara's parts, Credo written ex novo). Notice also that Zelenka's Credo is listed as a separated work.
Missa Providentiae should be therefore listed as a "collaboration", or a "group work", I suppose.
Thanks!
