This is followed by the Agnus Dei, which consists of three parts. The organ begins this part of the liturgy and alternates with the choir. At the Holy Communion the music either accompanies the distribution of the elements or at the antiphon played just before that. At the end of the Mass the priest sang the last words, "ite missa est", and the organist performed the response, "Deo gratias." A Psalm verse follows, and sometimes after it there is a "sortie", a procession.