Missa Brevis is a type of short mass setting in the Roman Catholic Church, typically featuring a simplified musical structure. It usually includes the essential parts of the mass, such as the Kyrie, Gloria, Credo, Sanctus, and Agnus Dei, but omits some of the longer texts. Composers like Wolfgang Amadeus Mozart and Joseph Haydn have created famous examples of Missa Brevis, showcasing their unique styles. These compositions are often performed in liturgical settings, making them accessible for smaller choirs and congregations while still maintaining a sense of reverence and beauty.