- Winchester Tropers
- Two manuscripts, provenance of Old Minster, Winchester, England. The earlier, c. 996, contains the oldest version of the liturgical drama Quem quaeritis trope with both text and music. The later, c. 1050, is a revised version of the earlier but also has a supplement of 150 organa on mostly Alleluias and responsories for the divine office, composed in parallel note-againstnote style with occasional contrary motion. This is the first practical source of polyphony in Western music.
Historical dictionary of sacred music. Joseph P. Swain. 2006.