The Eton Choirbook is one of three large choirbooks, containing Latin liturgical music, to survive the Reformation. It contains richly illuminated scores by 24 different composers dating from 1490-1530. However, most of the scores are incomplete or damaged. Of the 224 scores, 98 are missing. According to Tudor England: An Encyclopedia, "Rich sonorities, lengthy melismatic melodic lines, unexpected melodic and harmonic twists, and extravagant rhythmic complexities characterize the distinctive musical style of Eton Choirbook Compositions...and is a unique monument to the genius of the early Tudor period" (243).
Tudor England: An Encyclopedia