French Organ Mass

Essentially it is a Low Mass with organ music playing throughout: part of the so-called alternatim practice.

The Sanctus begins with an organ verse and proceeds in any of the following three ways: This is followed by the Agnus Dei, which consists of three parts.

At the end of the Mass the priest sang the last words, "ite missa est", and the organist performed the response, "Deo gratias."

The 1662 ceremonial specified that the original melodies had to be clearly audible in certain versets, and in cases when Missa cunctipotens was used, organists generally complied.

Additionally, an anonymous manuscript (Paris Conservatoire Rés.746, formerly 24827) created around 1680 contains an organ mass by an unknown composer.