Final answer:
The five consistent texts of the Catholic Mass are known as the Ordinary parts. They include the Kyrie, Gloria, Credo, Sanctus, and Agnus Dei, distinct from the variable Proper parts and are crucial in sacred music, especially during the Renaissance period.
Step-by-step explanation:
The five texts of the Catholic Mass which remain the same from day to day are called the Ordinary parts. These include essential and consistent components such as the Kyrie, Gloria, Credo, Sanctus, and Agnus Dei. The Ordinary contrasts with the Proper parts of the Mass, which change daily according to the liturgical calendar.
Principle liturgical forms such as masses and motets which were prominent throughout the Renaissance period are examples of works that utilized the Ordinary of the Mass. Sacred music during this time often incorporated these unchanging texts even as composers began to explore secular forms like the madrigal for spiritual compositions.
Moreover, the role of the sacraments within Catholicism demonstrates the importance of these liturgical texts and rituals, as they were integral to the practice of faith and held a significant place in Christian worship.