Musique Sacrée - Mozart: Requiem, Gregorian Chants, Vivaldi: Stabat Mater, Beatus Vir, Gloria

I found this set in the markdown bin of a music store in 1997. I find it beautiful, peaceful, & thrilling at times. Any time I hear other recordings of the Vivaldi pieces & the Mozart Requiem they just don't seem right, as I am so used to hearing these. I can't find any information about these on the net. They are all vocal so... :) I just hope some others will love them too.