Music was a very important part of sacred and secular daily life in the Middle Ages. It was a major component of all religious services in which prayers were chanted, including the Mass services attended each week by all Christians and the canonical office hours observed several times each day by clergy and monks; it also served a less formal religious role in the devotional songs of the laiety. Music for the sacred services, known as plainchant, is by far the largest surviving repertory of music from the period, consisting of thousands and thousands.....