- A musical manuscript, often very large, designed to be set on a stand so that the whole choir could sing polyphony from it at once. The soprano part appears on the top lefthand page above the tenor. The alto appears on the top right-hand page above the bass.
Historical dictionary of sacred music. Joseph P. Swain. 2006.
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Choirbook — 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. Often for polyphonic works all the musical parts or… … Wikipedia