Vivaldi composed several settings of the "Gloria". This arrangement of "Et in Terra Pax" comes from the most famous, RV 589, and was originally for the chorus.
Dietrich Buxtehude is often considered the founder of the German Baroque style. While he is often overlooked in favor of composers such as Bach and Handel, most of his contemporaries (including the aforementioned pair) considered him the ideal to which they should aspire. Buxtehude's "Missa Brevis" is considered a masterpiece...