thumb|upright=2.2|One opening (fol. 19v-20r) of the Chigi codex, showing the Kyrie of Ockeghem's [[Missa Ecce ancilla Domini. Cantus and tenor are on the left page, contratenor and bassus on right.]] A choirbook is a large format manuscript used by choirs in churches or cathedrals during the Middle Ages and Renaissance. The book is large enough for the entire choir to read from one book and may contain either monophonic gregorian chant or polyphony, with voice parts laid out individually across an opening's facing pages.
thumb|upright=2.2|One opening (fol. 19v-20r) of the Chigi codex, showing the Kyrie of Ockeghem's [[Missa Ecce ancilla Domini. Cantus and tenor are on the left page, contratenor and bassus on right.]] A choirbook is a large format manuscript used by choirs in churches or cathedrals during the Middle Ages and Renaissance. The book is large enough for the entire choir to read from one book and may contain either monophonic gregorian chant or polyphony, with voice parts laid out individually across an opening's facing pages.
Choirbooks were generally put on a stand with the smaller boy sopranos in front and the men in back. As the printing of music became easier and paper replaced vellum, choirbooks fell out of favour, replaced by smaller, cheaper, and easier to handle partbooks and octavos. A kind of choirbook format is still prevalent in music for piano four hands.
Discovered by embedding cosine similarity (sentence-transformers MiniLM, 384-dim).