Sentence:  The <WSD>polychoric</WSD> motets of the Venetian school (Willaert, the Gabrielis, etc., some of whose motets are found in CW vol. 10 and IM vols. 1-2) furnish striking possibilities for multiple brass choirs. 
Meaning of the word marked with <WSD> tags:  Of or pertaining to the use of more than one chorus; that uses or is intended to use more than one chorus.