Church music was very important. The mass was the main form of church music. It used the five parts of the mass Ordinary (the Eucharist service): "Kyrie, Gloria, Credo, Sanctus" and "Agnus Dei". The priests in the churches wanted church music to be serious. They did not want it to become popular. They thought that if people enjoyed it too much they would forget about worshipping God. Religious plays had become very popular. They told stories from the Bible. However, the church leaders banned them, so they were performed in the streets and squares of the towns.