The Mirror of Man's Salvation: Music in Devotional Life About 1500
Composers working during the last quarter of the fifteenth century wrote many more motets than previous composers had done. At any rate, far more have come down to us. This apparent explosion of activity coincided with the founding, reorganization, or revitalization of a number of cathedral or princely chapel choirs. Moreover, the character of the motet as a musical genre also seems to have changed at about the same time. By far the largest number of motets composed before 1475 set texts celebrating the Virgin Mary, or else they were compositions written to celebrate particular political or social occasions.