Valentin Rathgeber used different forms for his mass compositions: in Opus I the form of a missa brevis as well as in Opus III and Opus XIX the form of a missa solemnis. Moreover, he distinguishes in Opus XII between the form of a missa ruralis allowing the reduction of the setting without changing the character of the composition, and the form of a missa civilis. In Opus VII Rathgeber has written a different mass for each Marian feast. These compositions display various forms.