In music the word mass is used for a piece of music, to be sung by a choir. The Roman Catholic, Anglican and Lutheran churches use this. There are two very broad kinds of masses: Those using the Ordinary are not linked to the Church calendar, they use the same pieces (and words) throughout the year. The Proper covers the parts of the mass that vary through the year. At the start, masses were sung in Latin or Greek. Examples of masses not in English include the Deutsche Messe by Franz Schubert or A German Requiem by Johannes Brahms. 